Question
Use the image to answer the question.
An illustration of a coordinate plane with four quadrants shows the x-axis ranging from negative 9 to 9 and the y-axis ranging from negative 11 to 11 in increments of 1. A solid upward line with arrows at both ends is plotted on the graph. The line passes through the plotted points left parenthesis 0 comma negative 4 right parenthesis and left parenthesis 1 comma negative 1 right parenthesis.
Using the graph, derive the equation of the line in slope-intercept form.
(1 point)
Responses
y=3x+4
y equals 3 x plus 4
3x−y=4
3 x minus y equals 4
y=3x−4
y equals 3 x minus 4
y=−3x−4
The correct answer is:
y=3x-4
To derive the equation of the line in slope-intercept form, we will use the two given points on the line: (0, -4) and (1, -1).
First, let's find the slope of the line. The slope (m) is given by the formula:
m = (change in y) / (change in x)
Plugging in the coordinates of the two points:
m = (-1 - (-4)) / (1 - 0)
= 3 / 1
= 3
Now that we have the slope (m), we can use the point-slope form of a linear equation:
y - y1 = m(x - x1)
Using the point (0, -4):
y - (-4) = 3(x - 0)
y + 4 = 3x
Rearranging the equation:
y = 3x - 4
Therefore, the equation of the line in slope-intercept form is:
y = 3x - 4