#$&*
course MTH 163
Using the model we obtained, y = .8 x + 1.4, we note that the cost is represented by y and the number of widgets by acts. Thus we can find cost of 7 widgets by letting x = 7:
cost = y = .8 * 7 + 1.4 = 7.
To find the number of widgets you can get for $10, let y = 10. Then the equation becomes
10 = .8 x + 1.4.
We easily solve this equation by subtracting 1.4 from both sides than dividing by .8 to obtain x = 10.75. That is, we can buy 10.75 widgets with $10.
"