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(Systems of Linear Equations MC)

Which point is a solution to the system of linear equations?

[tex]\[
\begin{array}{l}
y = -x + 2 \\
3x - y = 6
\end{array}
\][/tex]

A. [tex]$(-1, 3)$[/tex]
B. [tex]$(0, 2)$[/tex]
C. [tex]$(2, 0)$[/tex]
D. [tex]$(3, -1)$[/tex]


Sagot :

To determine which point is a solution to the system of linear equations, we need to check each point against the given equations and see which one satisfies both equations:

[tex]\[ \begin{array}{l} y = -x + 2 \\ 3x - y = 6 \end{array} \][/tex]

The points given are [tex]\((-1, 3)\)[/tex], [tex]\((0, 2)\)[/tex], [tex]\((2, 0)\)[/tex], and [tex]\((3, -1)\)[/tex]. We will test each point step-by-step.

1. Point [tex]\((-1, 3)\)[/tex]:
- For [tex]\(y = -x + 2\)[/tex]:
[tex]\[ 3 = -(-1) + 2 \implies 3 = 1 + 2 \implies 3 = 3 \quad \text{(True)} \][/tex]
- For [tex]\(3x - y = 6\)[/tex]:
[tex]\[ 3(-1) - 3 = 6 \implies -3 - 3 = 6 \implies -6 = 6 \quad \text{(False)} \][/tex]
This point does not satisfy the second equation.

2. Point [tex]\((0, 2)\)[/tex]:
- For [tex]\(y = -x + 2\)[/tex]:
[tex]\[ 2 = -0 + 2 \implies 2 = 2 \quad \text{(True)} \][/tex]
- For [tex]\(3x - y = 6\)[/tex]:
[tex]\[ 3(0) - 2 = 6 \implies 0 - 2 = 6 \implies -2 = 6 \quad \text{(False)} \][/tex]
This point does not satisfy the second equation either.

3. Point [tex]\((2, 0)\)[/tex]:
- For [tex]\(y = -x + 2\)[/tex]:
[tex]\[ 0 = -2 + 2 \implies 0 = 0 \quad \text{(True)} \][/tex]
- For [tex]\(3x - y = 6\)[/tex]:
[tex]\[ 3(2) - 0 = 6 \implies 6 - 0 = 6 \implies 6 = 6 \quad \text{(True)} \][/tex]
This point satisfies both equations.

4. Point [tex]\((3, -1)\)[/tex]:
- For [tex]\(y = -x + 2\)[/tex]:
[tex]\[ -1 = -3 + 2 \implies -1 = -1 \quad \text{(True)} \][/tex]
- For [tex]\(3x - y = 6\)[/tex]:
[tex]\[ 3(3) - (-1) = 6 \implies 9 + 1 = 6 \implies 10 = 6 \quad \text{(False)} \][/tex]
This point does not satisfy the second equation.

After checking all the points, we can conclude that the point [tex]\((2, 0)\)[/tex] is the only solution that satisfies both equations in the system.

Thus, the solution to the system of linear equations is:

[tex]\[ (2, 0) \][/tex]
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