SOLUTION: Can you please help me with this problem. It told me to solve by multiplication or addition. 7x - 3y = -2 2x - 5y = -13

Algebra ->  Expressions-with-variables -> SOLUTION: Can you please help me with this problem. It told me to solve by multiplication or addition. 7x - 3y = -2 2x - 5y = -13      Log On


   

Question 43394: Can you please help me with this problem. It told me to solve by multiplication or addition. 7x - 3y = -2
2x - 5y = -13
Answer by benni1013(206) About Me  (Show Source):
You can put this solution on YOUR website!
In your case it would be better to solve by multiplication because the coefficients of x or y are not the same.
7x - 3y = -2
2x - 5y = -13
Choose either the x or y to start. I'll choose the y. The common factor between them is 15. Multiply the top by 5 and the bottom by 3.
35x-15y=-10
-6x-15y=39
Switch the signs before the equals sign
35x-15y=-10
-6x+15y=39
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29x=29
x=1
Plug 1 back into x for one of the equations.
7(1)-3y=-2==>7-3y=-2==>-3y=-9==>y=3
The ordered pair answer is (1,3)