Exercise 55 Page 431

We were asked to find the x-intercept of a graph. To do so, we will need to substitute 0 for one variable and solve.

Finding the x-intercept

Think of the point where the graph of an equation crosses the x-axis. The y-value of that ( x, y) coordinate pair is equal to 0, and the x-value is the x-intercept. To find the x-intercept of the given equation, we should substitute 0 for y and solve for x.

An x-intercept of 6 means that the graph passes through the x-axis at the point ( 6,0). This corresponds to answer H.