Question

Kim bought 4 shirts and 3 pairs of jeans for 109.85.
Jim bought 6 shirts and 1 pair of jeans for 94.95
The shirts and the jeans all cost the same amount. What is the cost, in dollars, of one pair of jeans?

Answer 1

Damn, she likes clothes.

Answer 2

If a is the cost of shirts and b is the cost of jeans:\[4a+3b=109.85\]\[6a+b=94.95\]You can just solve these equations simultaneously to get the answer.

Answer 3

or write \[b=94.95-6a\] and substitute. either way

Answer 4

That is solving them simultaneously.

Answer 5

But do I want to substitute for b (cost of jeans) if i'm trying to find the cost of the jeans? Shouldn't i subsitute for a ?

Answer 6

Yes, but sometimes its easier to find b first and then find a.