A straight-line graph of distance y (km) against time x (hours) passes through (0, 0) and (2, 90). What distance does the graph show at x = 3 hours?

Question

Accepted Answer

135. Through the origin: y = mx. Using (2, 90): 90 = 2m, m = 45. So y = 45x; at x = 3, y = 135 km.

A straight-line graph of distance $y$ (km) against time $x$ (hours) passes through (0, 0) and (2, 90).
What distance does the graph show at $x = 3$ hours?