solve the system of equations. -4x+6y=38 x-5y=-20

1 answer

To solve the system of equations:

  1. \(-4x + 6y = 38\)
  2. \(x - 5y = -20\)

We can solve these equations using the substitution or elimination methods. Let's use the substitution method.

First, solve the second equation for \(x\):

\[ x = 5y - 20 \]

Now we can substitute this expression for \(x\) in the first equation:

\[ -4(5y - 20) + 6y = 38 \]

Expanding this:

\[ -20y + 80 + 6y = 38 \]

Combine like terms:

\[ -14y + 80 = 38 \]

Now, isolate \(y\) by subtracting 80 from both sides:

\[ -14y = 38 - 80 \] \[ -14y = -42 \]

Now, divide by -14:

\[ y = \frac{-42}{-14} = 3 \]

Now that we have \(y\), substitute back to find \(x\) using the expression \(x = 5y - 20\):

\[ x = 5(3) - 20 \] \[ x = 15 - 20 \] \[ x = -5 \]

Thus, the solution to the system of equations is:

\[ x = -5, \quad y = 3 \]

The solution can be written as the ordered pair \((-5, 3)\).