Linear equation in intercept form is = + , where is the rate of change and is the - intercept.
The input variable is the number of extra hours and the output variable gives the total earnings of John per day.
Change in output values = 20
Change in input values = 1
Rate of change = = = 20
Working backwards with the values in the table, we get (0, 70).
So, the linear equation that satisfies the table is
[Substitute rate of change and - intercept values.]
Correct Answer is : = 20 + 70