Verified answer

y = -4x + b

20 = -4(-3) + b

20 = 12 + b

8 = b

y = -4x + 8

You put in the form of the equation of a line, y=mx+b. So plug in the points for x and y, and the slope, m. We're solving for the y-intercept, b.

20= -4(-3)+b

Multiply

20= 12+B

Subtract 12 from both sides

8=b

Equation: y=-4x+8

Answer

y= -4x + 8

Solution

y=mx + b

slope = m

y-intercept = b

Check:

-4(-3) + 8 =

12 + 8 =

20