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Solve each system by using substitution. 3x - y = 4 x + 5y = -4

Solve each system by using substitution. 3x - y = 4 x + 5y = -4
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Solve each system by using substitution.
3x - y = 4
x + 5y = -4

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User Liga
by
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1 Answer

3 votes

Answer:


from \: last \: equation : \\ x = - 4 - 5y - - - (a) \\ substitute \: in \: first \: equation \\ 3( - 4 - 5y) - y = 4 \\ - 12 - 15y - y = 4 \\ - 16y = 16 \\ y = - 1 \\ \\ therefore \: from \: (a) \\ x = - 4 - 5( - 1) \\ x = 1

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User Krist
by
8.1k points
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