Question 163036
A pencil cost .50 and a pen cost .25. If Will spends 5 dollars on 17 pens and pencils, how many of each does he buy?
:
Let x = no. of pencils
Let y = no. of pens
:
x + y = 17
Arrange for substitution
y = (17-x)
and
.50x + .25y = 5.00
Substitute (17-x) for y and find x
.50x + .25(17-x) = 5.00
solve for x