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Hunter-Best [27]
3 years ago
9

-3x + 7 y = -16 -9x + 5y = 16

Mathematics
2 answers:
Akimi4 [234]3 years ago
4 0

Answer:

x=44/3, y=4

Step-by-step explanation:

Assuming you have to solve for x and y

-3x+ 7y = -16 (1)

-9x+ 5y =16 (2)

multiply (1) by -3 and add it to (2)

9x-21y=48

-9x+5y=16

Add up and get

-21y+5y=48+16 combine like terms

16y=64 divide both sides by 16 and get

y=4

Substitute y=4 in (1)

-3*x+7*4=-16

28+16=3x

44=3x

x=44/3

ArbitrLikvidat [17]3 years ago
3 0

Answer:

<h2>x = -4</h2><h2>y = -4</h2><h2 />

Step-by-step explanation:

-3x + 7y = -16   (-3)  to eliminate x

<u>-9x + 5y = 16</u>

<u> 9x - 21y = 48</u>

      -16y = 64

           y = 64/-16

           y = -4

substitute y= -4 into eq. 1

-3x + 7y = -16

-3x + 7(-4) = -16

-3x = -16 + 28

  x = 12 / -3

  x = -4

<u> check:</u>

-3(-4) + 7(-4) = -16

- 16 = -16 ok

-9x + 5y = 16

-9(-4) + 5(-4) = 16

16 = 16  ok

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