First, we find the slope of the line. This is y_1-y_2/x_1-x_2, which is 3-7/0-2=-4/-2=2. Now, we need the y-intercept. This is fairly easy, as we have a graph. We see (0, 3) is the y-intercept. Therefore, we have the equation y=2x+3. Here is the graph:
https://www.desmos.com/calculator/eenucyoqak
:)