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"When solving systems by substitution use the following steps: 1. Solve one of the equations for a variable 2. Substitute for the variable in the other equation and solve. 3. Substitute for and solve for the remaining variable" Source and further information: https://teacherweb.com/ID/Preston/Smith/astnotes_SysSubstitution.pdf Implementation: 1. solve [x+2y=10] for x: x=102y 2. substitute x in the other equation: 3(102y)y=2 ...and solve: 306yy=2 7y=28 y=4 3. substitute y in [x=102y]: x=102*4 x=108 x=2

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