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Mathematics
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OpenStudy (macaylam):
Please help!! Will give medal Mark is solving the following system. x+y+z=2 (1) 3x+2y+z=8 (2) 4x-y-7z=16 (3) Step 1: He multiplies equation (1) by 7 and adds it to equation (3). Step 2: He multiplies equation (3) by 2 and adds it to equation (2). Which statement explains Mark’s mistake? - He added equation (3) instead of equation (2) in step 1. - He did not multiply equation (3) by the correct value. - He did not eliminate the same variables in steps 1 and 2. - He added equation (3) and equation (2) instead of subtracting.
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