Question

Substituon method x-3y=7
3x-3y=15

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

Get the value for x

$x-3y=7\\x=7+3y\\so\\3(7+3y)-3y=15\\9y+21-3y=15\\6y+21=15\\6y=15-21\\6y=-6\\y=-1\\ (put..this...in...1st..eq)\\x-3y=7\\x-3(-1)=7\\x+3=7\\x=7-3\\x=4$