SOLUTION: 2a-4b=6 and -a+2b=-3 solve using substituiton

Question 829302: 2a-4b=6 and -a+2b=-3 solve using substituiton
Answer by erica65404(394) (Show Source): You can put this solution on YOUR website!

solve one of the equations for a.

You can use the substitution method by replacing any a with 2b+3 since a is equal to 2b+3.

whenever you are left without the variable, and the statement is true, ie -3 is equal to -3, then it means infinite solutions. if it were untrue, ie 5 is equal to 2, then it would be no solution. Since -3=-3, b=any number. And since b is any number, a would also be any number.
answer: a=any number, b=any number
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