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vova2212 [387]
3 years ago
10

What’s the value of x in the equation 3x - y = 18 when y = 27

Mathematics
2 answers:
ira [324]3 years ago
8 0
You would have to insert the number into the variable. For example,
3x - 27 = 18
Then, you would isolate the x value (3x).
3x = 18 + 27
Simplify.
3x = 45
Finally, divide both sides by the coefficient.
\frac{ 45}{3} = \frac{3x}{3}
You end up with
x = 15
Anarel [89]3 years ago
6 0

Firstly, we substitute y by 27 to form this equation:

3x - 27 = 18

Equation step-by-step:

3x = -27 = 18 → we take -27 to the right side of the equation

3x = 18 + 27 → we solve for 18 + 27

3x = 45 → we take 3 to the right side of the equation

x = 45 / 3 → we solve for 45 / 3

x = 15 → final answer


Hope it helped,


BioTeacher101

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Use the ditributive property for -8 (x / 3)
ioda
Greetings!

"Use the distributive property for -8 (x / 3).<span>"

The distribute property is used to simplify an expression/equation. This is done by multiplying the contents of the parenthesis by the number outside of bracket.

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Hope this helps.
-Benjamin



4 0
3 years ago
What is the solution of the system? Use elimination. <br> 3x - 4y = 9<br> -3x + 2y = 9
densk [106]
You add two equations together to eliminate a variable. This particular problem is nice, because it's already setup to eliminate X.

3x - 4y = 9
<span>-3x + 2y = 9
</span>
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We continue with -4y + 2y (leaves us with -2y) and 9+9 (18).

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Confirm with the final equation:

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6 0
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Read 2 more answers
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Answer:

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