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A variable needs to be eliminated to solve the system of equations below. Choose the correct first step.

{:[10 x-8y=-12],[4x+8y=96]:}
Add to eliminate 
x.
Subtract to eliminate 
y.
Add to eliminate 
y.
Subtract to eliminate 
x.

A variable needs to be eliminated to solve the system of equations below. Choose the correct first step.\newline10x8y=124x+8y=96 \begin{array}{c} 10 x-8 y=-12 \\ 4 x+8 y=96 \end{array} \newlineAdd to eliminate x \mathbf{x} .\newlineSubtract to eliminate y \mathbf{y} .\newlineAdd to eliminate y \mathbf{y} .\newlineSubtract to eliminate x \mathbf{x} .

Full solution

Q. A variable needs to be eliminated to solve the system of equations below. Choose the correct first step.\newline10x8y=124x+8y=96 \begin{array}{c} 10 x-8 y=-12 \\ 4 x+8 y=96 \end{array} \newlineAdd to eliminate x \mathbf{x} .\newlineSubtract to eliminate y \mathbf{y} .\newlineAdd to eliminate y \mathbf{y} .\newlineSubtract to eliminate x \mathbf{x} .
  1. Given System of Equations: We are given the system of equations:\newline{10x8y=124x+8y=96 \begin{cases} 10x - 8y = -12 \\ 4x + 8y = 96 \end{cases} \newlineTo eliminate a variable, we look for coefficients that are opposites or can be made into opposites. Here, the coefficients of yy are 8 -8 and 8 8 , which are already opposites. Therefore, we can add the two equations to eliminate yy.
  2. Eliminate Variable: Adding the two equations:\newline(10x8y)+(4x+8y)=12+96 (10x - 8y) + (4x + 8y) = -12 + 96 \newline10x+4x=84 10x + 4x = 84 \newlineThis step is just the setup for the addition and does not involve any calculations yet.