3x + 2y = 7 and x - 4y = -21

3x + 2y = 7 and x - 4y = -21
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1 Answer

line 1: 3x+2y=7   or 6x+4y=14

line 2   x-4y=-21

line 1+line2...7x=14-21=-7

x=-1

from line1, 2y=7-3x=7+3=10

y=5
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