Hello there!
This is true
As we can see in this example: x + y = 10, we can solve for one of the variables (let's say here we're solving for x), by subtracting y from both sides, leaving
x = 10 - y
I hope I helped!
If they have a proportional relationship, then set them up as a proportion
9/2 = y/3.....9 to 2 = y to 3
cross multiply
(2)(y) = (9)(3)
2y = 27
y = 27/2
y = 13.5 <== so when x = 3, y = 13.5
Your answer would be B, X+2 Y-1
Our goal is to isolate n. In order to do this, we must first get rid of the 15 on the left side of the equation.
To achieve this result, we must do the inverse of the operation on both sides of the equation. In other words, subtract 15 from both sides.
8n + 15 - 15 = 25 - 15
8n = 10
Now we must get rid of the 8, by again doing the inverse of the operation. Since 8 is multiplying n, we must divide it into both sides.
8n / 8 = 10 / 8
n = 1.25
Hopefully, this helps!
