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Over [174]
3 years ago
6

PLEASE HELP I JUST NEED TO KNOW HOW TO DO IT

Mathematics
2 answers:
RoseWind [281]3 years ago
7 0
Your answer should be x=7 and y=7
Brilliant_brown [7]3 years ago
5 0

Answer:

y=7, x=7

Step-by-step explanation:

They both equal y, so you can set the right part of the equations equal to each other

4x-21=2x-7

solve for x

2x-21=-7

2x=14

x=7

knowing x, we can now substitute back into one of the original equations to find y

y=4(7)-21=28-21=7

or

y=2(7)-7=14-7=7

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