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10%x + 1/2 y =5
x+y=22 /*(-1)
0,1x + 0,5y = 5 /*10
-x-y=-22
x+5y=50
4y=28
y=7
x+7=22
x=22-7
x=15
x=15
y=7
b)x+y=20 /*(-30)
30x +44y=768
-30x -30y = -600
30x +44y = 768
14y=168
y=12
x+12=20
x=20-12
x=8
x=8
y=12
10% x +½y = 5
x=22-y
0,1(22-y)+1/2y=5
x=22-y
2,2-0,1y+0,5y=5
x=22-y
0,4y=5-2,2
x=22-y
0,4y=2,8 /:0,4
x=22-y
y=7
x=22-7
y=7
x=15
y=7
b) x + y =20
30x + 44y=768
x=20-y
30*(20-y)+44y=768
x=20-y
600-30y+44y=768
x=20-y
14y=768-600
x=20-y
14y=168 /:14
x=20-y
y=12
x=20-12
y=12
x=8
y=12