If the question is looking for the slope formula, y = mx + b, then the equation would be y = 3x + 3. You can calculate the slope, “m,” by using “rise over run.” To calculate rise over run, just choose two points on the line whose coordinates, (x, y), are whole numbers, and then count how many squares you have to go up, rise, and how many squares you have to go to the right, run. After you have those two numbers, make it a fraction with rise on top and simply to get your slope. To find your y-intercept, b, just find the point where the line crosses the x-axis, and the y coordinate is your “b.” So if the y-intercept was (0,3), for example, your “b” would be 3.