Question

Solve the system of equations using your Desmos calculator:

3x+2y=2


−2x+y=8


(1 point)
Responses

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

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

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

(4, -2)
(4, -2)
Skip to navigation

1 answer

To solve the system of equations:

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

we can start by solving for \(y\) in the second equation:

From \(-2x + y = 8\), we can express \(y\) as: \[ y = 2x + 8 \]

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

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

Expanding this, we get: \[ 3x + 4x + 16 = 2 \]

Combining like terms: \[ 7x + 16 = 2 \]

Next, we isolate \(x\): \[ 7x = 2 - 16 \] \[ 7x = -14 \] \[ x = -2 \]

Now we substitute \(x = -2\) back into the equation for \(y\): \[ y = 2(-2) + 8 \] \[ y = -4 + 8 \] \[ y = 4 \]

Thus, the solution to the system of equations is: \[ (x, y) = (-2, 4) \]

Among the provided responses, the correct answer is: (-2, 4).