a)4x=y
y=x+13
4x-y=0
-x+y=13
3x=13/:3
x=13/3
-13/3+y=13
y=17 1/3
b)4(x-1)=y
(y-1)+13=x
4x-4=y
y-1+13=x
4x-y=4
-x+y=-12
3x=-8/:3
x=-8/3
8/3+y=-12
y=-14 2/3
C)x-1=4y
x-4y=1
-3y=-11/:(-3)
y=11/3
-x+11/3=-12
-x=-15 2/3/*(-1)
x=15 2/3
d)y-3x=2
-3x+y=2
x=6
-18+y=2
y=20
e)x+7y=10/*(-5)
5x-y=8
-5x-35y=-50
-36y=-42/:(-36)
y=42/36
y=7/6
5x-7/6=8
5x=9 1/6
5x=55/6 /*1/5
x=11/6
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a)4x=y
y=x+13
4x-y=0
-x+y=13
3x=13/:3
x=13/3
-13/3+y=13
y=17 1/3
b)4(x-1)=y
(y-1)+13=x
4x-4=y
y-1+13=x
4x-y=4
-x+y=-12
3x=-8/:3
x=-8/3
8/3+y=-12
y=-14 2/3
C)x-1=4y
(y-1)+13=x
x-4y=1
y-1+13=x
x-4y=1
-x+y=-12
-3y=-11/:(-3)
y=11/3
-x+11/3=-12
-x=-15 2/3/*(-1)
x=15 2/3
d)y-3x=2
4x-y=4
-3x+y=2
4x-y=4
x=6
-18+y=2
y=20
e)x+7y=10/*(-5)
5x-y=8
-5x-35y=-50
5x-y=8
-36y=-42/:(-36)
y=42/36
y=7/6
5x-7/6=8
5x=9 1/6
5x=55/6 /*1/5
x=11/6