Answer:
Explanation:
x = pens and y = pencils
4x + 5y = 6.71....multiply by 5
5x + 3y = 7.12....multiply by -4
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20x + 25y = 33.55 (result of multiplying by 5)
-20x - 12y = - 28.48 (result of multiplying by -4)
--------------------add
13y = 5.07
y = 5.07 / 13
y = 0.39 <=== cost of a pencil
4x + 5y = 6.71
4x + 5(0.39) = 6.71
4x + 1.95 = 6.71
4x = 6.71 - 1.95
4x = 4.76
x = 4.76/4
x = 1.19 <==== cost of a pen