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3 years ago

Solve for y 2x + y = 7 6x + 9 = 9y - 2x

Mathematics

2 answers:

irga5000 [103]3 years ago

5 0

Answer:

Step-by-step explanation:

what grade are u in?

NeX [460]3 years ago

4 0

This is a simultaneous equation
1)2x+y=7
2)-8x+9y=9

1)*4 (so 2x becomes 8x so we can add or take to get rid of x)

1)8x+4y=28
2)-8x+9y=9

2) + 1)

13y=37

Y=2.846153846

To check the answer is correct find x

8x+(4*2.84...)=28
8x=28-11.384..
8x=16.615..
X=2.0769..

Input into 2)

(-8*2.07..)+(9*2.84..)=9
It is equal to 9
So y is correct

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