A line contains the points (6, 10) and (15, 22). If the line intersects the y-axis at (0, b), what is the value of b?
We write this equation in slope intercept form using the two given points. With the slope formula, we find that the slope, m is 4/3. We currently have y=4/3x+b. We can plug either given point into this equation to find b. We plug in (6, 10) to get