Question

Please help!

Marta tried solve the system below, but she made a mistake. Read carefully and try to figure out what her mistake was.

solve the system below:
10x+y=22
2x+y=-2

y=22-10x=10x+(22-10x)=22
10x+22-10x=22
0x+22=22
22=22
infinitely many solutions.

Explain the mistake.

Answer 1

Is this an essay question?

Answer 2

yeah

Answer 3

Okay

Answer 4

Have you tried to solve out the system of equations and then compare your work to theirs?

Answer 5

system of equation means solve 2 or more equations at the same time
here 2 equations the first was rearranged to make y the subject then some other manipulation of addition properties etc. the second equation was not in this person's system.