If 4x+3y=10 and 2x+7y=20, determine a coefficient for x that makes the equation below true.

1 answer:

8 0

4x + 3y = 10 means 8x + 6y = 20
2x + 7y = 20 as well so
2x + 7y = 8x + 6y
-6x + y = 0

coefficient = -6

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