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OpenStudy (anonymous):
For which of the following systems of linear equations is the ordered pair (-1, 7) a solution? A. x - 4y = 1 2x - 3y = 11 B. y = 8 + x x + 2y = 13 C. x + 2y = 5 x + 3y = 4 D. x - 5y = -2 3x + 9y = 12
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OpenStudy (anonymous):
replace x by -1 and y by 7 and see which one works. it is rather tedious
OpenStudy (rulnick):
It's B.
OpenStudy (rulnick):
7 = 8 - 1 -1 + 2(7) = 13
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