Question 816099
System:
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x-5y=15
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4x-3y=26   (not exactly what you wrote, so not really sure)
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Multiply first equation by -4:
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-4x+20y=-60
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4x-3y=26
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ADD the left hand members and add the right hand members:
{{{highlight(0+17y=34)}}}
Simple to solve as {{{highlight(y=2)}}}.