Can someone pls teach me how to do 8, 9, 11, and 12?

8 y = -x + 1

9 y = x - 1

11 y = x + 2

12 y = -x - 3

Step-by-step explanation:

for 8 and 9 just subtract the x and move it to the other side

for 11 and 12 do the same thing move x to the other side but since y is negative you flip all of the signs on both sides of the equation

1/3 + 1/5 = 8/15.

step-by-step explanation:

hope it

thats not a system of equations, that is a solution