Solve the system of two equations using elimination with multiplication.

4x - 6y = -48
-2x + 4y = 30

1 answer

To solve the system of equations using the elimination method, we start with the two equations:

  1. \( 4x - 6y = -48 \)
  2. \( -2x + 4y = 30 \)

We want to eliminate one of the variables. We can do this by making the coefficients of \( x \) or \( y \) the same in both equations.

Let's eliminate \( x \). We will multiply the second equation by \( 2 \) to make the coefficient of \( x \) in the second equation become \( -4 \):

Multiply equation (2) by \( 2 \):

\[ -2x + 4y = 30 \implies -4x + 8y = 60 \]

Now our system of equations is:

  1. \( 4x - 6y = -48 \)
  2. \( -4x + 8y = 60 \)

Next, we add these two equations together to eliminate \( x \):

\[ (4x - 6y) + (-4x + 8y) = -48 + 60 \]

The \( 4x \) and \( -4x \) cancel out:

\[ -6y + 8y = 12 \]

Simplifying this gives:

\[ 2y = 12 \]

Now, we can solve for \( y \):

\[ y = \frac{12}{2} = 6 \]

Now that we have \( y \), we can plug this value back into one of the original equations to find \( x \). We can use equation (1):

\[ 4x - 6(6) = -48 \]

This simplifies to:

\[ 4x - 36 = -48 \]

Adding \( 36 \) to both sides gives:

\[ 4x = -48 + 36 \] \[ 4x = -12 \]

Now, divide by \( 4 \):

\[ x = \frac{-12}{4} = -3 \]

Thus, the solution to the system of equations is:

\[ x = -3, \quad y = 6 \]

So, the solution in ordered pair form is:

\[ \boxed{(-3, 6)} \]