Which equation has a graph that is parallel to the graph 2x−y=−1 2 x − y = − 1 ?

Your first step is to use the distributive property. Then just solve for x.

4(x - 5) - 8 = 18 → Given equation
4x - 20 - 8 = 18 → Distributive Property (4 × x and 4 × 5)
4x - 28 = 18 → Combine Like Terms (-20 - 8 = -28; always keep the sign if it's subtraction)
4x = 46 → Addition Property of Equality (Add 28 to both sides)
x = 11.5 or 11 ¹/₂