Examples:

Find the unique values of variables a and b. 15*a + 3*b=124.56*a + 8*b=77 Find the unique values of variables a and b. 3a - 2b = 4.5a + b = 5.5 Equation one plus two times equal two yields $$3a-2b+2(a+b)=4.5+2(5.5)\underset{}{\to }5a=15.5\underset{}{\to }a=3.1$$ example2sol.gif Plugging the value for a into either equation yields the result b=2.4.