Question

The table and the graph below each show a different relationship between the same two variables, x and y.

How much more would the value of y be on the graph than its value in the table when x = 12?

Answer 1

240

Explanation:

Using the straight line formula; y=mx+c, take two points, for example, (4, 80) and (5, 100)

m=change in y/change in x, so;

m=(100-80)/(5-4)= 20

Take point (4, 80)

80=20×4 + c

80-80=c=0

so y=20x

y=20×12=240