Question

SOS!Мне нужно срочно!!!3,9,10,12!!!!

Answer 1

3)y=1/2x+1=
x=1/2y+1
1/2y+1=x
y+2=2x
y=2x-2
9)y=x/3-1=
3y=x-3
-x=-3-3y
x=3+3y
x=3y+3
10)y=4-2x
2x=4-y
X=2 1/2y
12)y=2x/3+1/3
x=2y/3+1/3
2y+1=3x
2y=3x-1
y=3/2 x-1/2