# Maths

A farmer finds that he can buy 5 sheep and 5 cows for \$129 or 10 sheep and 17 cows for \$177.how much will it cost him to buy 3 sheeps and 2 cows?

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1. Let s represent the sheep, and c represent the cows
5s + 5c = 129
10s + 17c = 177
Your choice is to use elimination or substitution to solve for c and s.
If you multiply 5s + 5c = 129 by -2 and then add it to the second equation it works out nicely and you can solve for c
-10s - 10c = -645
10s + 17c = 177
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7c = -645 + 177 and solve for c, then sub it back in to solve for s...

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