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a)-2x+x=3y-1
-x=3y-1
5=x+4y
5-x=4y/-4y
5-x=y
b) x-3y=1-x-y
2x+2y=1/:2
x+y=1/2
5 = x + 4y
x = 5 + x - y - 1
x = 4 + x - y
0 = 4 - y
y = 4
x = 2x + 3*4 - 1
x = 2x + 11
-x = 11
x= -11
b) x - 3y = 1 - x - y / +x
2x + y = - 1
2x - 3y = 1 - y / + y
2x - 2y = 1
-1 - 3y = 1 /+1
-3y = 2
-y = 2/3
y= -(2/3)
2x + 2* -(2/3) = 1
2x -(4/3) = 1
2x = 2 i 1/3
x= 1i 1/6