Which equation has (2,-1) as a solution?
y=2x-1***
y=x+3
y=x-3
y=-2x+1
No.
Did you substitute the numbers for the letters in the equations?
?? I don't know what that means- how do I figure this out?
Ms Sue?
Please:( Idk
Uhhh, I believe it is C correct?
y = 2
x = -1
So isn't that A?
Is this right?
y=2x-1
2 = (2 * -1) - 1
2 = -2 - 1
Which equation has (2,-1) as a solution?
y=2x-1***
y=x+3
y=x-3
y=-2x+1
=======================
Now look
It has to work when x = 2 and y = -1
Try the first one
y=2x-1 so -1 = 2*2 - 1
so
-1 = 4-1
-1 = 3 ******* NO WAY
__________________________'
The second one
y = x + 3 so -1 = 2+3 NO WAY
The third one
y = x - 3 so -1 = 2 - 3 = -1 CARAMBA!!!
To determine which equation has (2,-1) as a solution, we can substitute the values of x and y into each equation to see which one satisfies the condition.
Let's start with the equation y = 2x - 1 and substitute x = 2 and y = -1:
-1 = 2(2) - 1
-1 = 4 - 1
-1 = 3 (which is not true)
Next, let's try the equation y = x + 3:
-1 = 2 + 3
-1 = 5 (which is also not true)
Now, let's attempt the equation y = x - 3:
-1 = 2 - 3
-1 = -1 (which is true)
Finally, let's test the equation y = -2x + 1:
-1 = -2(2) + 1
-1 = -4 + 1
-1 = -3 (which is not true)
Out of the four equations, only y = x - 3 satisfies the condition when substituting (2,-1) as x and y values. Therefore, the correct answer is y = x - 3.