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What is the ordered pair for 2x plus 5y equals 16 plus -5x minus 2y equals 2?
Wiki User
∙ 11y ago
2x + 5y = 16 + (-5x) - 2y = 2
That gives 2x + 5y = 2 . . . . . . . . . . (I)
and
-5x - 2y = - 14 or 5x + 2y = 14 . . . . (II)
(I)*5: 10x + 25y = 10
(II)*2: 10x + 4y = 28
Subtracting the second from the first, 21y = -18 so y = -18/21 = -6/7
and then by (I)
x = 1 - 5y/2 = 1 - 5/2*(-6/7) = 1 + 15/7 = 22/7
So the ordered pair is (22/7, -6/7)
Wiki User
∙ 11y ago
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