Question

Directions says use technology to solve

0.1x+0.2y=50
0.3x-0.1y=10

Answer 1

http://www.wolframalpha.com/input/?i=solve+0.1x%2B0.2y%3D50+%2C0.3x-0.1y%3D10
wolfram|alpha counts as technology

Answer 2

multiplí both sides with10 on every two equation and will get
x+2y=500
3x+y=100

Answer 3

x+2y=500
3x+y=100 /*2 multiply with 2 and subtract from first equation

Answer 4

x+2y=500
6x+2y=200
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-5x 0 =300
-5x=300
x=300/-5 = - 60
-60+2y=500
2y=560
y=560/2=280
y=280

x= -60
y= 280