substitution method: \[ 3 x+2 y=2 \text { and } 5 x-2 y=-18 \]
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The Deep Dive
To use the substitution method, first solve one of the equations for one variable. Let's take the first equation: 1. Rearrange it to find \( y \): \[ 2y = 2 - 3x \] \[ y = 1 - \frac{3x}{2} \] 2. Now substitute \( y \) in the second equation: \[ 5x - 2(1 - \frac{3x}{2}) = -18 \] \[ 5x - 2 + 3x = -18 \] \[ 8x - 2 = -18 \] \[ 8x = -16 \] \[ x = -2 \] 3. Now substitute \( x \) back into the expression for \( y \): \[ y = 1 - \frac{3(-2)}{2} \] \[ y = 1 + 3 = 4 \] So the solution to the system of equations is \( x = -2 \) and \( y = 4 \). Want to know how to graphically represent this solution? Just plot both equations on the same graph, and you'll see they intersect at the point (-2, 4)!