Mathematics, 20.11.2019 22:31 thomasbarbusca15

You are a partner in your group with their problem. what mistake did they make solving the system?
3x+y-9
-2x+y=4

students work when solving the second equation for y:
y=2x+4
-2x+(2x+4)=4
-2x+2x+4=4
4=4

the students response is there are indefinitely many solutions and this is not correct. explain the mistake.

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