Читать книгу SAT Math For Dummies with Online Practice - Mark Zegarelli - Страница 71

You can plot an equation on the xy-plane point by point, by plugging in a few values for x and finding the resulting value for y in each case. For example, to plot the equation , plug in x-values of 0, 1, 2, and 3 into the equation and solve for y:

Thus, the graph of this equation includes the four points , , , and . The result is the line shown in Figure 2-4.

FIGURE 2-4: Plotting the graph of the equation .