You can put this solution on YOUR website! how do you solve linear equaions with the subsitution method?
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You get one variable in terms of the other in one of the eqns, then substitute for it into the other eqn. The result is one eqn in one variable which you can then solve.
If there are more than 2 variables, you eliminate one at a time by substitution.
Look at the solutions for examples.