Question

Solve the following system using the substitution method:
3x + y = -3
y = 2x + 7

Answer 1

Thanks so much! :)

Answer 2

Because you know that \(y = 2x + 7\), you can rewrite \(3x + \color{#C00}{y}\) as \(3x + \color{#C00}{2x + 7}\). Now\[3x + 2x + 7 = -3\]Can you solve this?

Answer 3

yeah x = -2 right?
so which answer would it be? thanks. :)

Answer 4

Okay, so because \(x = -2\), we know that \(y = 2x + 7\) can be written as \(y = 2(\color{#C00}{-2}) + 7\)

Answer 5

so which answer is it? (Sorry, I don't quite get it... :() Like which should I put in as "x" ,and which as "y"? In the coordinates box? See attached...

Answer 6

(x,y)

Answer 7

yes, what is the answer? what should I put in (x,y)?
thanks. :)

Answer 8

What do you get for \(x\) and \(y\)? :-)

Answer 9

do you work them out individually and add them?

Answer 10

Wait, are you awn786?

Answer 11

ye

Answer 12

no I'm not??

Answer 13

oohh i get it

Answer 14

LOL okay

Answer 15

Waa?

Answer 16

what about me @ParthKohli

Answer 17

\[x = -2 \ \ \ \& \ \ \ y = 2(-2) + 7\]

Answer 18

Thnks! :)

Answer 19

What is \(2(-2) + 7\)?

Answer 20

what about me @ParthKohli

Answer 21

3, right?

Answer 22

Yes. So you have \(x = -2\) and \(y = 3\).

Answer 23

THANK YOU SO MUCH!!! ;) :D

Answer 24

We always write the solutions like \((\mbox{solution for x, solution for y})\).

Answer 25

So \((-2,3)\)!

Answer 26

right I know that. :)

Answer 27

THANKS SO MUCH!!! :D

Answer 28

Yay!