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3x=5+y /:3
x=5+y/3
b) 1/3y=x-3
-x=-1/3y-3 /:(-1)
x=1/3y+3
c) 3(x-y)=2x
3x-3y=2x
3x-2x=3y
x=3y
d) 2/3x=3/4y /*12
8x=9y /:8
x=9/8y
x=1 1/8y
e) 4x+2y=1
4x=1-2y /:4
x=1-2y/4
f) 6x-2/3y /:6
6x=2+2/3y /:6
x=2+2/3y /6
2.a) 3x=12 /:3
x-y=1
x=4
4-y=1
x=4
-y=1-4
x=4
-y=-3 /:(-1)
x=4
y=3
b) 5y=2
x+y=2 2/5
5y=2 /:5
x+y=12/5
y=2/5
x+2/5=12/5
y=2/5
x=12/5-2/5
y=2/5
x=10/5
x=2
y=2/5
c) 4y-x=6
17y=0 /:17
4y-x=6
y=0
4*0-x=6
y=0
0-x=6
y=0
-x=6 /:(-1)
y=0
x=-6
y=0
d) a=b
2a+b=9
a=b
2b+b=9
a=b
3b=9 /:3
a=b
b=3
a=3
b=3
e) u=4v
5u-v=10
u=4v
5*4v-v=10
u=4v
20v-v=10
u=4v
19v=10 /:19
u=4v
v=10/19
u=4*10/19
v=10/19
u=40/19
v=10/19
f) 3r=s
3r+s=24
3r=s
s+s=24
3r=s
2s=24 /:2
3r=s
s=12
3r=12 /:3
s=12
r=4
s=12
:):):)