# hi, thanks for reading this

I have a question for finding vertical and horizontal asymptotes! as to finding the intercepts, domain, and graphing it all together...

like y= 6 over (x+3)

I don't quite understand the concepts and things, but if you can give me a hand that'll be great!

y = 6 / (x+3)

Domain: all possible x values.

Range: all possible y values.

Intercepts: the (x,y) coordinates where the graph intersects the x- and y-axes.

Asymptotes: Horizontal and vertical lines representing x- and y-values that the graph approaches, but never reaches.

I assume that you have a graphing calculator. Set your window so that x and y both range from -10 to +10. Then graph y = 1/x. This is the "inverse" or reciprocal function; for any value x, y is its reciprocal. If x=2, then y=1/2; if x=-7, then y=-1/7. X and y are either both positive or both negative. If the absolute value of x is large, then the absolute value of y is small, and vice versa.

There is one value which neither x nor y will ever be: zero. X can't be zero, because that would be dividing by zero. y=1/x can be manipulated to become xy=1 (multiply both sides by x), and then or x=1/y (from xy=1, divide both sides by y).

Therefore the domain (all possible x values) is: x does not = zero. Ditto the range (all possible y values): y does not = zero.

If you look at the graphs, as a positive x value gets smaller and smaller, it approaches zero, but never reaches it. Similarly, a negative x value can increase and get closer and closer to zero, but never reaches it. x=0 is a value that the graph approaches, but never reaches. We call the line x=0 an asymptote of y=1/x.

Similarly, both positive and negative y values can approach, but never reach 0. Thus, the line y=0 is also an asymptote of y=1/x.

The equation y=mx+b represents a whole "family" of linear equations which have similar properties. Similarly, the y=ax^2+bx+c represents a whole family of quadratic equations.

Similarly, y=1/x is the simplest form of a whole family of "inverse" equations: y=k/(x-h), where k and h are any two numbers except zero, represents a whole family of "inverse" functions.

k "multiplies" the y=1/x equation. Graphically, the y=1/x equation is "vertically stretched". Try k=5. y=5/x. Graph it. You'll see the same 2 curves, but they rise much more steeply near the y axis.

h moves the two curves right by h units. If h=3, then y=1/(x-3). Notice that the denominator has a minus sign, not a plus sign. Since the denominator can't be zero, x-3 can't be zero, so x can't be 3. That means the two curves approach the vertical asymptote x=3. This has the effect of moving both y=1/x curves 3 units to the right. If x = -4, then y=1/(x - (-4)) = 1/(x+4). Now x+4 can't be zero, so x can't = -4, so the vertical asymptote is x=-4.

Can you move the horizontal asymptote up or down? Yes, if you define the basic "family" function as y=k/(x-h) + q. Positive q moves the entire graph upwards, negative q moves it downwards, and the horizontal asmymptote becomes y=q.

For your y=6/(x+3), the domain (x) values are x not = -3, and the vertical asymptote is x = -3. The range (y) values are y not = 0, so the vertical asymptote is y = 0.

How about intercepts? Intercepts are the values where the graph inersects the x- and y-axes. For the y-intercept, x = 0. For your equation, when x=0, y=6/(3+0)=2, so the y-intercept is (0,2). For the x-intercept, y=0. But, we just decided that y can't be 0, so there is no x-intercept.

Hope that helps.

Aram

## To find the vertical and horizontal asymptotes of the function y = 6 / (x+3), follow these steps:

1. Vertical Asymptotes:

- Vertical asymptotes occur when the denominator of the fraction equals zero since division by zero is undefined.

- Set the denominator equal to zero and solve for x:

x + 3 = 0

x = -3

- The vertical asymptote is x = -3.

2. Horizontal Asymptote:

- To find the horizontal asymptote, consider the behavior of the function as x approaches positive infinity and negative infinity.

- As x approaches positive infinity (x becomes very large), the fraction becomes very close to zero since the numerator (6) is a finite number and the denominator (x + 3) becomes much larger.

- As x approaches negative infinity (x becomes very small and negative), the fraction becomes very close to zero since the numerator (6) is a finite number and the denominator (x + 3) becomes much smaller.

- Therefore, the horizontal asymptote is y = 0.

3. Intercepts:

- To find the y-intercept, set x = 0 in the equation y = 6 / (x+3) and solve for y:

y = 6 / (0 + 3) = 6 / 3 = 2

- The y-intercept is (0, 2).

- There is no x-intercept since the numerator (6) is a non-zero constant.

4. Domain:

- The domain of a function consists of all possible x-values that the function can take.

- For the function y = 6 / (x+3), x cannot equal -3 since it would result in division by zero. Therefore, the domain is all real numbers except x = -3.

5. Range:

- The range of a function consists of all possible y-values that the function can take.

- In this case, since the numerator (6) is a non-zero constant, the range can be any real number except y = 0 (horizontal asymptote).

- Therefore, the range is all real numbers except y = 0.

6. Graphing:

- To graph the function y = 6 / (x+3), plot the y-intercept at (0, 2).

- Draw a vertical asymptote at x = -3.

- The graph should approach the vertical asymptote as x gets closer to -3 and approach the horizontal asymptote y = 0 as x gets larger or smaller.

- You can use a graphing calculator or graphing software to plot additional points and visualize the shape of the graph.

I hope this explanation helps you understand the concepts of finding vertical and horizontal asymptotes, intercepts, domain, and graphing of a rational function.