felix3190 felix3190

20-02-2024
Mathematics

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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
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