hamiltonpeyton8949 hamiltonpeyton8949

27-12-2017
Mathematics

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If 7x + 2y = 3 and x - 3y = 30, what is the solution

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ElenaClaudia ElenaClaudia

27-12-2017

7x+2y=3 | ×3
x-3y=30 | ×2

21x + 6y = 9
2x - 6y = 60 +
--------------------------
23x / = 69
x = 69:23
x = 3

7x + 2y = 3
21 + 2y = 3
2y = -18
y = -9

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