Solve the system of equations using your Desmos calculator:

3x+2y=2

−2x+y=8

(1 point)
Responses

(-2, 4)
(-2, 4)

(14, -20)
(14, -20)

(-4, 2)
(-4, 2)

(4, -2)

1 answer

Let's solve the system of equations given:

  1. \( 3x + 2y = 2 \)
  2. \( -2x + y = 8 \)

To solve this system, we can use substitution or elimination. Here, I'll use the elimination method.

From the second equation, we can express \( y \) in terms of \( x \):

\[ y = 2x + 8 \]

Now, substitute \( y \) in the first equation:

\[ 3x + 2(2x + 8) = 2 \]

Expanding this gives:

\[ 3x + 4x + 16 = 2 \]

Combining like terms:

\[ 7x + 16 = 2 \]

Now, isolate \( x \):

\[ 7x = 2 - 16 \] \[ 7x = -14 \] \[ x = -2 \]

Now substitute \( x = -2 \) back into the expression for \( y \):

\[ y = 2(-2) + 8 \] \[ y = -4 + 8 \] \[ y = 4 \]

So, the solution to the system of equations is:

\[ (x, y) = (-2, 4) \]

Now, checking the response options, the correct answer is:

(-2, 4).