M= 4 (7,7) what is the equation Ax+by=c
y - y₁ = m(x - x₁) y - 7 = 4(x - 7) y - 7 = 4(x) - 4(7) y - 7 = 4x - 28 + 7 + 7 y = 4x - 21-4x + y = -21 4x - y = 21
