Solve the system of two equations using elimination with multiplication. 4x−6y=−48 −2x+4y=30 (1 point)

(−21,−6) left parenthesis negative 21 comma negative 6 right parenthesis (−3, 6) left parenthesis negative 3 comma 6 right parenthesis (3, 9) left parenthesis 3 comma 9 right parenthesis (−33,−9)

1 answer

To solve the system of equations using elimination, we have the following two equations:

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

First, we can modify Equation 2 to align the coefficients of \(x\) when we eliminate the variable \(x\). We can multiply Equation 2 by 2 to make the coefficient of \(x\) match the coefficient of \(x\) in Equation 1.

Multiplying Equation 2 by 2:

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

This gives us:

\[ -4x + 8y = 60 \quad \text{(Equation 3)} \]

Now we have:

  1. \( 4x - 6y = -48 \) (Equation 1)
  2. \( -4x + 8y = 60 \) (Equation 3)

Next, we can add Equation 1 and Equation 3 together to eliminate \(x\):

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

This simplifies to:

\[ 0x + 2y = 12 \]

Thus, we have:

\[ 2y = 12 \]

Dividing both sides by 2 gives:

\[ y = 6 \]

Now that we have the value of \(y\), we can substitute it back into one of the original equations to solve for \(x\). We can use Equation 1:

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

Calculating this, we have:

\[ 4x - 36 = -48 \]

Adding 36 to both sides:

\[ 4x = -12 \]

Dividing both sides by 4 gives:

\[ x = -3 \]

Thus, the solution to the system of equations is:

\[ (x, y) = (-3, 6) \]

The answer is:

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