Question

complete the solution of the equation. find the value of y when x equals 15.
-x+2y=-1

Answer 1

This is one of the more basic things you need to know about algebra so pay close attention :)
\[\Large -\color{red}x +2\color{blue}y = -1\]

Answer 2

You are given \[\Large \color{red}x = \color{red}{15}\]
Right?

Answer 3

yes

Answer 4

What you do is *replace* all the x's in your equation with 15. Like so:
\[\Large -\color{red}{15}+2\color{blue}y = -1\]

Answer 5

Are you following so far?

Answer 6

yes

Answer 7

Now, your task is to solve for the value of y... any idea how to do that?

Answer 8

no

Answer 9

The first thing you need to do is bring ALL the terms without y to one side (to the right side) and all the terms WITH y to the left side.

Now, this term:
\[\Large -15 \boxed{\color{green}{+2y}}= -1\]is the only term with y.

While these terms...\[\Large \boxed{\color{orange}{-15}}+2y = \boxed{\color{orange}{-1}}\]
do not have y, and thus belong on the right-side.

-15 is still on the left, so how do you bring it to the right side?

Answer 10

i think

Answer 11

You think? LOL I asked you a question.... how do you bring that -15 to the correct (right) side?