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Lawrence
Mathematics
3 May, 00:15
5x - y = 7 Solving Systems by Substitution
-3x - 2y = - 12
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Madilynn Buchanan
3 May, 00:45
0
Switch the equation around.
5x - y = 7
y=5x-7
Then, substitute.
-3x - 2y = - 12
-3x - 2 (5x-7) = - 12
-3x - 10x + 14 = - 12
-13x = - 26
x=2
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