Question

Shopping at savers mart, lisa buys her children four shirts and three pairs of pants for 85.50.she returns the next day and buys three shirts and five pairs of pants for 115.00

Answer 1

4s + 3p = 85.50......multiply by 3
3s + 5p = 115.........multiply by -4
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12s + 9p = 256.50 (result of multiplying by 3)
-12s - 20p = -460 (result of multiplying by -4)
---------------add
-11p = - 203.50
p = -203.50 / -11
p = 18.50 <=== the cost of a pair of  pants

3s + 5p = 115
3s + 5(18.5) = 115
3s + 92.50 = 115
3s = 115 - 92.50
3s = 22.50
s = 22.50/3
s = 7.50 <=== the cost of each shirt