Have you tried to doanythingat all for yourself? Have you graphed the lines? If so, then you know that you are asked for the area of atriangle.

The formula for area of a triangle is (1/2)bh where b is the length of the base and h is the height. Here, b is equal to the difference of x values where the two line cross the x-axis. h is the y value where the two lines cross.