Unit recovery

Equations

100

 

2x+4y=8

x=−2y+4

200

y=5x-10

x=1/5y+2

300

y=3x+9

x=13y−3

400

5x-7y=12

 x=7/5y+12/5

500

3x+2y=12

x=−2/3y+4