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Nuetrik [128]
3 years ago
7

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

Mathematics
2 answers:
liq [111]3 years ago
4 0

Answer:

C

Step-by-step explanation:

Since y will have same value, y doesn't really matter. Thus,

We can solve for y in the 2nd equation as:

-3x - y = 4

-3x - 4 = y

Now we can plug it into the first and solve for x:

-9x + 4y = 8

-9x + 4(-3x - 4) = 8

-9x - 12x - 16 = 8

-21x = 8 + 16

-21x = 24

x = 24/-21

x = -8/7

Correct answer is C.

Alisiya [41]3 years ago
3 0

Answer: Option C

C-8/7

Step-by-step explanation:

We have the following equations

 -9x + 4y = 8 and -3x - y = 4

We want to find a value of x that satisfies both equations and obtains the same value of y.

To find the value of x, clear the value of y in both equations

-9x + 4y = 8\\\\-9x + 4y -8 = 0\\\\-9x -8 = -4y\\\\y = \frac{9}{4}x +2

------------------------------

-3x - y = 4\\\\\-3x -y - 4 = 0\\\\y = -3x -4

Now solve both equations and solve for x.

\frac{9}{4}x +2 = -3x -4\\\\\frac{21}{4}x = -4-2\\\\\frac{21}{4}x = -6\\\\21x = -24\\\\x = -\frac{24}{21}\\\\x = -\frac{8}{7}

The answer is x = -\frac{8}{7}

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