SOLUTION: 21. 3x+5y=15 23. -4x+3y=12 25. x-7y=3 I am not sure how to solve with 2 variables. please help me!!!

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: 21. 3x+5y=15 23. -4x+3y=12 25. x-7y=3 I am not sure how to solve with 2 variables. please help me!!!      Log On


   

Question 60922This question is from textbook beginning algebra
: 21. 3x+5y=15
23. -4x+3y=12
25. x-7y=3 I am not sure how to solve with 2 variables. please help me!!! This question is from textbook beginning algebra

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
ONE EQUATION WITH TWO VARIABLES CANNOT BE UNIGUELY SOLVED BECAUSE
THERE ARE MANY DIFFERWENT COMBINATIONS OF VALUES FOR EACH VARIABLE.
EXAMPLE 3X+5Y=15 IF X=5 THEN Y=0 OR IF X=0 THEN Y=3
IF YOUR TRYING TO SOLVE FOR X OR Y THE
3X+5Y=15
3X=15-5Y
X=15/3-5Y/3
X=5-5Y/3
OR SOLVING FOR Y THEN
3X+5Y=15
5Y=15-3X
Y=15/5-3X/5
Y=3-3X/5