We want to find the x- and y-intercepts for each line from the previous exercise.
Top Line
In the previous exercise we have already found that the y-intercept of the top line is (0,10). We also found the equation of the line.
y=- 1/4x+10We can use this equation to determine the x-intercept of the line.
Think of the point where the graph of an equation crosses the x-axis. The y-value of that ( x, y) coordinate pair is 0, and the x-value is the x-intercept. To find the x-intercept of the equation, we should substitute 0 for y and solve for x.
An x-intercept of 40 means that the graph passes through the x-axis at the point ( 40,0).
Bottom Line
In the previous exercise we also found that the y-intercept of the bottom line is (0,3). We have found the equation of the line as well.
y=1/3x+3
We can use this equation to determine the x-intercept of the bottom line. Again, to find the x-intercept of the equation, we will substitute 0 for y and solve for x.
