Well this is simple. When ever it comes to a question about finding a variable (y), you always have to think about the original equation of the line. In this example since the line is straight, it is then: y=mx+c. The information from the table will be used, subtraction will be done to find the equations for both tables which are. Table 1 (line graph): y= 3/2x Table 2: y= 5/4x. What to do now is to substitute x=12 in both equations which are Y=3/2(12) =18 Y=5/4(12) =15 Finally since we are finding the difference. 18-15=$3
