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2015-02-09T18:45:19+08:00

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5x - y = 8 \\
-5x + 4y = -17

add both equations x to x, y to y and constant to constant.

5x - 5x + (-y + 4y) = 8-17 \\
3y = -9 \\
y = -3\\
x=1
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Thank you po! I'll use it as an example and guide in my homework!
2015-02-09T22:57:46+08:00

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Since if you add both equations, and since if 5x and -5x is added they will become 0, that means wala na ang y. Kay i-add lang ang dalawang equation.
 
       5x   - y =    8
+   -5x + 4y = -17
        0 + 3y = -9
            3y = -9
           3y / 3 = -9/3
           y = -3

Kaya, ngayon, puwede na ang y maging -3, kaya subukan nating palitan ang y at ipalit natin ang -3 para x na lang ang maiwan.

-5x + 4y = -17
-5x + 4 (-3) = -17
-5x - 12 = -17
-5x = -17 + 12
-5x = -5
-5x / -5 = -5 / -5
x = 1

Kaya, ang x = 1, at y = -3

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