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Mathematics
Ryleigh Collier
4 October, 21:29
Solve for y
2x + y = 7
6x + 9 = 9y - 2x
+1
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2
)
Jovani Hopkins
4 October, 23:27
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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Josephine Madden
5 October, 00:20
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Step-by-step explanation:
what grade are u in?
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