3 years ago

Find the value of the expression. 21 - -6

Mathematics

1 answer:

Licemer1 [7]3 years ago

3 0

Answer:

Step-by-step explanation:

Subtracting a negative is like adding

21 - -6

21 +6

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Answer:

The solution to the system of equations be:

x = 3

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Step-by-step explanation:

Given the system of equations

x + y = 12

-x + 2y = 15

Let us solve the system of equations by elimination

$\begin{bmatrix}x+y=12\\ -x+2y=15\end{bmatrix}$

adding the equations

$-x+2y=15$

$+$

$\underline{x+y=12}$

$3y=27$

solve 3y = 27 for y

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divide both sides by 3

$\frac{3y}{3}=\frac{27}{3}$

Simplify

$y=9$

For x+y=12 plug in y = 9

$x+9=12$

Subtract 9 from both sides

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Therefore, the solution to the system of equations be:

x = 3

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brainly.com/question/17593667

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