Solve the system of two linear equations.

-3x - 4y = -23
3x - 5y = 5

1 answer

To solve the system of equations:

  1. Equation 1: \(-3x - 4y = -23\)
  2. Equation 2: \(3x - 5y = 5\)

We can use the method of substitution or elimination. Here, I will use the elimination method.

First, let's multiply Equation 1 by -1 to make the coefficients of \(x\) in both equations opposites:

\[ 3x + 4y = 23 \quad \text{(Equation 3)} \]

Now we have:

  1. Equation 3: \(3x + 4y = 23\)
  2. Equation 2: \(3x - 5y = 5\)

Next, we can subtract Equation 2 from Equation 3 to eliminate \(x\):

\[ (3x + 4y) - (3x - 5y) = 23 - 5 \]

This simplifies to:

\[ 4y + 5y = 18 \] \[ 9y = 18 \]

Now, solve for \(y\):

\[ y = \frac{18}{9} = 2 \]

Now that we have the value of \(y\), we can substitute it back into one of the original equations to find \(x\). We'll use Equation 2:

\[ 3x - 5(2) = 5 \]

This simplifies to:

\[ 3x - 10 = 5 \]

Now, add 10 to both sides:

\[ 3x = 15 \]

Now divide by 3:

\[ x = 5 \]

Thus, the solution to the system of equations is:

\[ \boxed{(5, 2)} \]