Question

Solving Systems Algebraically with Substitution

x + 3y = 5
-2x - 4y = -5

I'm really confused on what I should do first?
I think I solve for x which means minusing -3y to the other side of the equal sign...

x = -3y + 5

Is that correct? :c

Answer 1

yes that is right.
but it wont be necessary to do it with the second equation
just substitute the first equation that you get ( x = -3y + 5) to the x variable of the second equation, then just simplify it to solve for y.

2nd equation you have: -2x - 4y = -5
substitute x = -3y + 5 into the second equation: -2(-3y+5)-4y=-5
then solve for y

Answer 2

Okay so it would go like this;

6y + 5 - 4y = -5
6y - 4y = -10
2y = -10
y = -5

Answer 3

almost right! just a little mistake!