3 years ago

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

Mathematics

1 answer:

Tcecarenko [31]3 years ago

5 0

$r=-3s\\r=10-4s\\\\-3s=10-4s\ \ \ \ |add\ 4s\\-3s+4s=10\\s=10\\\\r=-3\cdot10=-30$

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