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arlik [135]
3 years ago
8

Solve the system of equations by the substitution method. - x + 3y = 7 - 3x + 8y = 19

Mathematics
1 answer:
solmaris [256]3 years ago
6 0

- X = 7 -3y

=> X = 3y -7

Now substitute it in 2nd equation!

-3x+ 8y =19

=> -3 (3y- 7) + 8y =19

=> -9y +21 +8y = 19

=> -y = 19-21

<h3>=> y = 2</h3>

Now x= 3y-7

=> X = 3×2-7

=> X = 6 -7

<h3>=> X = -1</h3>
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