Systems of Linear Equations Unit Test

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Question
Solve the system of equations.
4x−8y=−36

−6x+y=32
(1 point)

1 answer

To solve the system of equations:

  1. The first equation is:
    \(4x - 8y = -36\)
    We can simplify this equation by dividing everything by 4:
    \[x - 2y = -9 \quad \text{(Equation 1)}\]

  2. The second equation is:
    \(-6x + y = 32 \quad \text{(Equation 2)}\)

Now, let's solve these equations using the substitution or elimination method. Here, I will use substitution.

From Equation 1, we can express \(x\) in terms of \(y\):
\[x = 2y - 9\]

Now substitute this expression for \(x\) into Equation 2:
\[-6(2y - 9) + y = 32\]

Distributing in the equation:
\[-12y + 54 + y = 32\]

Combine like terms:
\[-11y + 54 = 32\]

Now, isolate \(y\):
\[-11y = 32 - 54\]
\[-11y = -22\]
\[y = 2\]

Now that we have \(y\), substitute \(y = 2\) back into the expression for \(x\):
\[x = 2(2) - 9\]
\[x = 4 - 9\]
\[x = -5\]

Thus, the solution to the system of equations is:
\(\boxed{(-5, 2)}\)