auzriannamarie
31.01.2020 •
Mathematics
Which ordered pair is the solution to the system?
x+5y=−3
2x+7y=3
a.(12, −3)
b.(−13, 2)
c.(−2, 1)
d.(22, −5)
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Ответ:
Multiply top equation by -2
---> -2x -10y = 6
---> 2x +7y = 3
Add them together
---> -3y = 9
Solve for y ...
Ответ:
i am virtuoso
add 5)5(5 to both sides
6x=4+56x=4+56x=4+5
simplify 4+54+54+5 to 999
6x=96x=96x=9
divide both sides by 666
x=96x=\frac{9}{6}x=69
simplify 96\frac{9}{6}69 to 32\frac{3}{2}23
x=32x=\frac{3}{2}x=23