# SOLUTION: Solve by using the multiplication principal and then add: 7p+5q=4 8p-9q=17 I can not for the life of me figure out how to get one of these to cancel out so that I can elimin

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Solve by using the multiplication principal and then add: 7p+5q=4 8p-9q=17 I can not for the life of me figure out how to get one of these to cancel out so that I can elimin      Log On

 Ad: You enter your algebra equation or inequality - Algebrator solves it step-by-step while providing clear explanations. Free on-line demo . Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help! Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

 Linear Solvers Practice Answers archive Word Problems Lessons In depth

 Click here to see ALL problems on Linear-systems Question 251529: Solve by using the multiplication principal and then add: 7p+5q=4 8p-9q=17 I can not for the life of me figure out how to get one of these to cancel out so that I can eliminate it by using the multiplication principal first...i started by multiplying the first equation by 2 but that doesn't seem to work...so im not sure if i an doing this right...thanks :) Answer by richwmiller(9143)   (Show Source): You can put this solution on YOUR website!either multiply the first by 8 and the second by 7 and subtract the two new equations or multiply the first by 9 and the second by 5 and add the two new equations