On the table, x is in the left column, y is in the right. Using the equation y = kx, we need to find k for that data 150 = k(1250) 150/1250 = k 0.12 = k
You can confirm that by doing the same with the second row, but I won’t put that here. It’s the same.
Dollars/kilowatt-hour is the label for the k of each equation (0.12, 0.15). We calculated dollars divided by (per) kWh.
Company P is less expensive than company M, because 0.12 < 0.15.
We need to buy 2,375 kWh of electricity from company P. The equation y = kx applies, where y is unknown, k = 0.12, and x = 2,375
