Question

An office supply store in san diego sells 7 writing tablets and 4 pens for $6.40 also two tablets and 19 pens cost $5.40 find the price of each

Answer 1

7t + 4p = 6.40
2t+ 19p = 5.40


Let’s substitute equation 1 in equation 2

T= (6.40 -4p)/7

2(6.4-4p)/7)) +19p=5.4
(12.8-8p)/7 +19p = 5.5
12.8-8p +133p = 38.5
125p= 25.7
P = 0.21

Tablets = 0.79