Substitution method: solve one equation for one variable, substitute into the other, and get an equation in one variable.
After finding the first variable, substitute back to find the second.
Start by isolating a variable whose coefficient is 1, if possible
Substitute the expression carefully, watching signs
Always check the answer in both equations of the system
Steps of the substitution method.
{y=2x+1x+y=7
x+(2x+1)=7⇒3x=6⇒x=2, y=5
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