How do you do a linear equation

Question

passes through (2,-1), slope + - 1/2

Answer 1

Use the Point-Slope Form of an Equation of a Line.

P(2,-1), m = 1/2

y - y₁ = m(x - x₁)

y + 1 = (1/2)(x - 2)

y + 1 = (1/2)x - 1

y = (1/2)x - 2