Solve for x_1
x_{1}=800-x_{2}
Solve for x_2
x_{2}=800-x_{1}
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800=x_{1}+x_{2}
Add 300 and 500 to get 800.
x_{1}+x_{2}=800
Swap sides so that all variable terms are on the left hand side.
x_{1}=800-x_{2}
Subtract x_{2} from both sides.
800=x_{1}+x_{2}
Add 300 and 500 to get 800.
x_{1}+x_{2}=800
Swap sides so that all variable terms are on the left hand side.
x_{2}=800-x_{1}
Subtract x_{1} from both sides.
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