slope intercept of (-3,0) m=-1/3
y - y₁ = m(x - x₁)y - 0 = ⁻¹/₃(x - (-3))y - 0 = ⁻¹/₃(x + 3)y - 0 = ⁻¹/₃(x) - ¹/₃(3)y - 0 = ⁻¹/₃x - 3 + 0 + 0 y = ⁻¹/₃x - 3