Marta tried solve the system below, but she made a mistake. Read carefully and try to figure out what her mistake was. What was Marta's mistake? Explain.
10x+y=22
2x+y=-2
y = 22-10x → 10x + (22-10x) = 22
→ 10x + 22 - 10x = 22
→ 0x + 22 = 22
→ 22 = 22
Definetly many solutions!
