Four computer desks and three office chairs cost $1110. Two desks and five chairs cost $940.
1 answer:
Let
d = cost of a computer desk
c = cost of an office chair
4d + 3c = 1110
2d + 5c = 940
multiply (2nd) equation by 2
4d + 3c = 1110
4d + 10c = 1880
------------------------subtract
-7c = - 770
c = 110
2d + 5c = 940
2d + 5(110) = 940
2d = 550 = 940
2d = 390
d = 195
answer
<span>cost of a computer desk = $ 195</span>
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