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wizard123
Just do a direct substitution.

Replace 'y' with '5x'

4x + 2(5x) = 7

4x + 10x = 7

14x = 7

x = 7/14 = 1/2

Sub into y=5x to find 'y'

y = 5(1/2) = 5/2 = 2.5

Answer:
x = 0.5, y = 2.5

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