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14-04-2018
Mathematics

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3x-4y=-17 and 8x-3y=-7

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jingbang1126p711gt jingbang1126p711gt

14-04-2018

From first equation,
3x = 4y-17
x =(4y - 17) / 3 - - - - - - Third equation

Substitute third equation into second equation,
32y / 3 - 136 / 3 - 3y = - 7
23y /33 = 115 / 33
23y = 115
y = 5

Substitute y = 5 into first equation,
3x - 4y =-17
3x - 4(5) = - 17
3x - 20 = - 17
3x = 3
x = 1

Thus, x = 1 and y = 5.

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