[tex]Slope = \frac{y2-y1}{x2-x1} [/tex]
Substitute as followed
y2 = -29
y1 = 21
x2 = -5
x1 = 5
Slope = [tex] \frac{(-29)- (21)}{(-5) - (5)} [/tex]
Solve
Slope = [tex] \frac{(-29)- (21)}{(-5) - (5)} [/tex]
Slope = [tex] \frac{-50}{-10} [/tex]
Slope = 5
So far your equation is
y = 5x + b
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Solve for B ( to solve for B substitute x for -5 and y for -29 in the equation)
B = -4
y = 5x - 4 is your answer