We are given a system of two linear equations with two variables, $x$ and $y$: $-5x + y = -7$ $-3x - 2y = -12$ The goal is to solve for $x$ and $y$.

AlgebraSystem of Linear EquationsElimination MethodSubstitution MethodSolving Equations
2025/3/10

1. Problem Description

We are given a system of two linear equations with two variables, xx and yy:
5x+y=7-5x + y = -7
3x2y=12-3x - 2y = -12
The goal is to solve for xx and yy.

2. Solution Steps

We can use the substitution or elimination method. Let's use the elimination method.
Multiply the first equation by 2:
2(5x+y)=2(7)2(-5x + y) = 2(-7)
10x+2y=14-10x + 2y = -14
Now we have:
10x+2y=14-10x + 2y = -14
3x2y=12-3x - 2y = -12
Add the two equations to eliminate yy:
(10x+2y)+(3x2y)=14+(12)(-10x + 2y) + (-3x - 2y) = -14 + (-12)
13x=26-13x = -26
Divide by -13:
x=2613x = \frac{-26}{-13}
x=2x = 2
Now substitute x=2x = 2 into the first equation 5x+y=7-5x + y = -7:
5(2)+y=7-5(2) + y = -7
10+y=7-10 + y = -7
y=7+10y = -7 + 10
y=3y = 3
So the solution is x=2x = 2 and y=3y = 3.
We can verify the solution by plugging x=2x=2 and y=3y=3 into the second equation:
3x2y=12-3x - 2y = -12
3(2)2(3)=66=12-3(2) - 2(3) = -6 - 6 = -12
The equation holds true.

3. Final Answer

x=2,y=3x = 2, y = 3

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