Posted by Barney on .
solve by the elmination method
0.3x0.2y=4
0.4x+0.3y=49/23

math 
Reiny,
1st one by 30 > 9x  6y = 120
2nd by 20 > 8x +6y = 980/23
add them
17x = 3740/23
x = 220/23
back into 8x + 6y = 980/23
1760/23 + 6y = 980/23
6y = 780/23
y = 130/23