Question

Find the x value so that the line through the points (x,-9) and (0,1) has a slope of -4

Answer 1

Find x in equation.
M = -4
$y = m(x) + b \\ 1 = 0 + b \\ b = 1$
$y = m(x) + b \\ - 9 = ( - 4)(x) + 1 \\ - 10 = - 4x \\ x = \frac{5}{2}$