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7x+2y=2 2x-y=10 what is the value of y? a. y=-22 b. y=22 c. y=2 d. y=-6
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7x+2y=2 2x-y=10 what is the value of y? a. y=-22 b. y=22 c. y=2 d. y=-6
asked
Jul 6, 2018
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7x+2y=2
2x-y=10
what is the value of y?
a. y=-22
b. y=22
c. y=2
d. y=-6
Mathematics
high-school
Zbdiablo
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7x+2y=2
2x-y=10
7x = 2-2y
x= (2-2y)/7------eq. 1
By substituting the value of x in eq. 1
2 {(2-2y)/7} - y =10
{ (4 -4y)/7 } -y =10
( 4-4y -7y)/7=10
4- 11y = 70
-11y = 70-4
-11y = 66
y= -6
The value of y is -6 and so, option d is correct.
Gunner
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Jul 7, 2018
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Gunner
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The value of y is -6.
First, I figured out that the value of x is 2, so I plugged in two the the 2nd equation.
2(2) - y = 10 ⇒ 4 - y = 10
- 4 - 4
-----------------------
- y = 6
-----------
-1 -1
y = -6
Kimora
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Jul 10, 2018
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Kimora
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