SOLUTION: 6.2x-0.5y=27.8 0.3x+0.4y=68.7

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: 6.2x-0.5y=27.8 0.3x+0.4y=68.7      Log On


   

Question 157243This question is from textbook algebra 1
: 6.2x-0.5y=27.8
0.3x+0.4y=68.7 This question is from textbook algebra 1

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
6.2x-0.5y=27.8 multiply by 4
0.3x+0.4y=68.7 multiply by 5 & add.
24.8x-2y=111.2
1.5x+2y=343.5
--------------------------
26.3x=454.7
x=454.7/26.3
x=17.289 answer.
6.2*17.289-.5y=27.8
107.1916-.5y=27.8
-.5y=27.8-107.1916
-.5y=-79.3916
y=-79.3916/-.5
y=158.78326 answer.
Proof:
.3*17.289+.4*158.78326=68.7
5.1867+63.5133=68.7
68.7=68.7