Question

Which value of x satisfies both -9x + 4y = 8 and -3x - y = 4 given the same value of y?

ОА
1
7
ОВ.
7
9
Ос.
8
7
D. -9
OE.
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Answer 1

-
`(8)/(7)`

Explanation:

-9x+4y=8

-3x-y=4

Multiple the entire second equation by 4

-12x-4y=16

-9x+4y=8

__________

-21x=24

divide each side by -21 and simplify

x= -
`(8)/(7)`