Question

Stefi likes smaller apple slices. The equation y = 9x represents the relationship between the number of apples, x, and the number of slices, y, she gets. Which graph represents the relationship?
On a coordinate plane, a graph has number of apples on the x-axis and number of slides on the y-axis. A line goes through points (0, 12) and (2, 15).
On a coordinate plane, a graph has number of apples on the x-axis and number of slides on the y-axis. A line goes through points (0, 0) and (2, 18).
On a coordinate plane, a graph has number of apples on the x-axis and number of slides on the y-axis. A line goes through points (0, 9) and (1, 18).
On a coordinate plane, a graph has number of apples on the x-axis and number of slides on the y-axis. A line goes through points (0, 0) and (6, 15).

Answer 1

The second graph. It goes through (0,0) and (2,18). The slope is (18−0)/(2−0)=9 and the y-intercept is 0, so the equation is y = 9x.