−5x − 8y = 17 2x − 7y = −17

Question

02-10-2016
Mathematics

contestada

−5x − 8y = 17 2x − 7y = −17

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phicxs phicxs · Answer 1 · 2016-10-02T15:08:02+02:00

phicxs phicxs

02-10-2016

Elimination Method

-5x - 8y = 17 (×2)
2x - 7y = -17 (×5)

-10x - 16y = 34
10x - 35y = -85
____________
-51y = -51
y = 1

-5x - 8(1) = 17
-5x - 8 = 17
-5x = 17 + 8
-5x = 35
x = -7

(-7, 1)

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