Question

What is the x-coordinate of the solution of the system?

{5x-y=-21}
{x+y=-3}

Answer 1

20R1

Answer 2

and second one -3

Answer 3

@ryanchick: "helping" others does not include just handing out answers. Please show your stuff by guiding TexMechanica towards finding his/her own correct answer.

Answer 4

@TexMechanica:

Here you are given a system of linear equations and are asked to find the solution, or at least part of it. If you can eliminate y from both equations, you'll have one equation in x alone, that can be solved for x.

Methods to consider using: substitution, addition/subtraction, graphing.

Answer 5

okay sorry im new

Answer 6

I don't even know where to begin.

Answer 7

dont worry

Answer 8

ill try and help

Answer 9

{5x-y=-21}
{x+y=-3}

might be a little easier to visualize if you remove the brackets:

5x-y=-21
x +y=-3

Tex: simply add these two equations together, column by column. Write your result below. This is the "addition/subtraction" method of elimination.

Answer 10

@TexMechanica

Answer 11

I don't know.

Answer 12

Thanks for the help guys but i gotta go anyway.