01-12-2014
Mathematics

Answered

substitution method-
r = -3s
r= 10 - 4s

Answer :

01-12-2014

[tex]r=-3s\\r=10-4s\\\\-3s=10-4s\ \ \ \ |add\ 4s\\-3s+4s=10\\s=10\\\\r=-3\cdot10=-30[/tex]

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