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Vlad1618 [11]
3 years ago
10

−3x + 7y = −16 −9x + 5y = 16 slove this

Mathematics
1 answer:
Ahat [919]3 years ago
5 0


{-3x+7y=-16 ⇒ -3x=-16-7y    (↓)

{-9x+5y=16

The second equation:

-9x+5y=16

3*(-3x)+5y=16         <em>Substitute -3x    (↑)</em>

<em>3* </em>(-16-7y)+5y=16

-48-21y+5y=16      /+48

-16y=64      /:(-16)

y=-4

-3x=-16-7y

-3x=-16-7*(-4)=-16+28=12

-3x=12    /:(-3)

x=-4

<em /><em>Solution: (-4; -4)</em>



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