# Find the Slope and Y-Intercept (-2,3) , (1,-9) (-2,3) , (1,-9)
Find the value of the slope.
Slope is equal to the change in y over the change in x, or rise over run.
m=change in ychange in x
The change in x is equal to the difference in x-coordinates (also called run), and the change in y is equal to the difference in y-coordinates (also called rise).
m=y2-y1x2-x1
Substitute in the values of x and y into the equation to find the slope.
m=-9-(3)1-(-2)
Simplify.
Simplify the numerator.
Multiply -1 by 3.
m=-9-31-(-2)
Subtract 3 from -9.
m=-121-(-2)
m=-121-(-2)
Simplify the denominator.
Multiply -1 by -2.
m=-121+2
Add 1 and 2.
m=-123
m=-123
Divide -12 by 3.
m=-4
m=-4
m=-4
Find the value of the y-intercept.
Substitute the value of m into the slope-intercept form of the equation, y=mx+b.
y=(-4)⋅x+b
Substitute the value of x into the slope-intercept form of the equation, y=mx+b.
y=(-4)⋅(-2)+b
Substitute the value of y into the slope-intercept form of the equation, y=mx+b.
3=(-4)⋅(-2)+b
Rewrite the equation as (-4)⋅(-2)+b=3.
(-4)⋅(-2)+b=3
Multiply -4 by -2.
8+b=3
Move all terms not containing b to the right side of the equation.
Subtract 8 from both sides of the equation.
b=3-8
Subtract 8 from 3.
b=-5
b=-5
b=-5
The values of the slope and y-intercept are m=-4 and b=-5.
m=-4
b=-5
Find the Slope and Y-Intercept (-2,3) , (1,-9)   ## Download our App from the store

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