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2y=1/3*(x-1)+7
1 - x=4*(y-1)
2y=x/3-1/3+7
-x=4y-4-1
2y=x/3 -1/3+7
x=5-4y
2y=(5-4y)/3-1/3+7 /*3
6y=5-4y-1+21
10y=25
y=2,5
1-x=4*(2,5-1)
1-x=10-4
-x=5
x=-5
b)
(x-2)/2-(y+3)/5=x+2y /*10
(3-2x)/3-(4y-2)/6=2-x/2 /*6
5x-10-2y-6=10x+20y
6-4x-4y+2=6-3x
-5x=22y+16
-x=4y-2
-5x=22y+16
x=2-4y
-5(2-4y)=22y+16
-10+20y=22y+16
-2y=26
y=-13
x=2-4(-13)
x=2+52=54