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kumpel [21]
3 years ago
10

Substitute -3x-8y=4 -2x+7y=15

Mathematics
1 answer:
Nikolay [14]3 years ago
3 0
-2x=15-7y
x=-7.5+3.5y

-3x-8y=4
-3(7.5+3.5y)-8y=4
-22.5-10.5y-8y=4
-22.5-18.5y=4
-18.5y=4+22.5
-18.5y=26.5
y=-53/35

the fraction might not be in lowest terms.
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