Question

Which ordered pair would form a proportional relationship with the point graphed below?


On a coordinate plane, a line goes through points (0, 0), (10, 40) and (negative 10, negative 40).
(40, 10)
(–5, –10)
(5, 20)
(–10, –20

Answer 1

The line through (0,0) and (10,40) has slope 40/10 = 4, so y = 4x. Plugging the choices, only (5, 20) satisfies 20 = 4·5. Thus (5, 20).