Question 245977
0.3x-0.2y=4
0.2x+0.5y=-21/23
multiply the first equation by 5
.15x-y=20

and the second by 2
.4x+y=-42/23
.15x-y=20
add the two equations
.19x=(460-42)/23
.19x=418/23
x=(418/23)/.19
x=95.6522
0.3x-0.2y=4
0.2x+0.5y=-21/23
multiply the first by 2
0.6x-0.4y=8
and the second by 3
0.2x+0.5y=-21/23
0.6x+1.5y=-63/23
0.6x-0.4y=8
subtract
 1.9y=-8-63/23
y=(247/23)*(1.9)
y=5.65217