x+1.3*(y-x)=0.22 (1)
x+0.9*（y-x）=0.16 (2)
(1)-(2)
0.4(y-x) = 0.06
y-x=0.15 (3)
from (1) and (3)
x+1.3*(y-x)=0.22
x+ 1.3*0.15 =0.22
x+0.195=0.22
x=0.025
from (3)
y-x=0.15
y-0.025=0.15
y=0.175
二元一次方程组的解法！
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