SOLUTION: solve using addition method 3x-2.5y=7.125 2.5x-3y=7.3125

Algebra ->  Linear-equations -> SOLUTION: solve using addition method 3x-2.5y=7.125 2.5x-3y=7.3125      Log On


   

Question 238654: solve using addition method
3x-2.5y=7.125
2.5x-3y=7.3125
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
3x-2.5y=7.125 eqn 1
2.5x-3y=7.3125 eqn 2
-------------
-18x + 15y = -42.75 eqn 1 x -6
12.5x- 15y = 36.5625 eqn 2 x 5
-------------------- Add
-5.5x = -6.1875
x = 1.125
------------
Sub for x into eqn 1
3*1.125 - 2.5y = 7.125
-2.5y = 3.75
y = -1.5