Solve the system of two equations using elimination with multiplications. 4x - 6y = -48 -2x + 4y = 30

1 answer

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

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

To eliminate one of the variables, we can manipulate the equations. Let's eliminate \( x \) by making the coefficients of \( x \) equal.

First, we can multiply the second equation by 2 to match the coefficient of \( x \) in the first equation:

\[ 2(-2x + 4y) = 2(30) \]

This gives us:

\[ -4x + 8y = 60 \]

Now we have the system:

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

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

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

This simplifies to:

\[ 0x + 2y = 12 \]

Which simplifies further to:

\[ 2y = 12 \]

Now, divide both sides by 2:

\[ y = 6 \]

Now that we have \( y \), we can substitute \( y \) back into one of the original equations to solve for \( x \). We will use the second equation:

\[ -2x + 4(6) = 30 \]

This simplifies to:

\[ -2x + 24 = 30 \]

Subtract 24 from both sides:

\[ -2x = 30 - 24 \]

\[ -2x = 6 \]

Now divide by -2:

\[ x = -3 \]

The solution to the system of equations is:

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