Solve the system of equations below using elimination. You must show all work to earn full credit. −4x−6y=−24 4x+5y=24

1 answer

To solve the system of equations using the elimination method, we start by writing down the equations clearly:

  1. \(-4x - 6y = -24\) (Equation 1)
  2. \(4x + 5y = 24\) (Equation 2)

Step 1: Aligning coefficients for elimination

We want to eliminate one of the variables. A good strategy is to eliminate \(x\) by making the coefficients of \(x\) in both equations equal. Notice that the coefficient of \(x\) in Equation 1 is \(-4\) and in Equation 2 is \(4\). We can multiply Equation 2 by 1 (since it's already suitable) and Equation 1 by 1 to keep them as they are, or we can directly consider adding them since they will cancel out with the right setup.

Step 2: Adding the equations

Let's add Equation 1 and Equation 2 directly to eliminate \(x\):

\[ (-4x - 6y) + (4x + 5y) = -24 + 24 \]

This simplifies to:

\[ (-4x + 4x) + (-6y + 5y) = 0 \]

Thus:

\[ 0 - y = 0 \]

This gives us:

\[ -y = 0 \implies y = 0 \]

Step 3: Substituting back to find \(x\)

Now that we have \(y = 0\), we can substitute this value back into one of the original equations to find \(x\). We can use Equation 2 for this:

\[ 4x + 5(0) = 24 \]

This simplifies to:

\[ 4x = 24 \]

Dividing both sides by 4 gives:

\[ x = 6 \]

Step 4: Writing the solution

The solution to the system of equations is:

\[ (x, y) = (6, 0) \]

Conclusion

Thus, the final answer of the system of equations is \((6, 0)\).