Question 1083513
1) 7x + 2y = 3
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2) y - x = 4
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solve equation 2 for y
:
y = x + 4
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substitute for y in equation 1
:
7x + 2(x + 4) = 3
7x + 2x + 8 = 3
9x = -5
x = -5/9
y = -5/9 + 4 = -5/9 + 36/9 = 31/9
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x + y = -5/9 + 31/9 = 26/9
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