Question

so x+2=y

2x=y+3

and you plug in x+2 in the 2x

so2(x+2)=y+3

2x+4=y+3 how would you solve this problem

Answer 1

that doesnt seem right, 2+x would not simplify to 2x. 2x is 2 times x

Answer 2

http://www.mathpapa.com/calc.html?q=2x%20 @%20x%3D3

Answer 3

im getting confuse

Answer 4

how can you solve it @J-bird

Answer 5

well, are you trying to solve for x or y??

Answer 6

yes

Answer 7

o,o

Answer 8

i said x OR y

Answer 9

butyou would have to plug in something @J-bird

Answer 10

Hello,

This is what we call a system of equations.

Note your equations are:
\(x+2=y\)
\(2x=y+3\)

To start to solve the system, choose which variable to solve for. In our case that would be \(x\) since one of the equations is set to \(y\).

\(x+2=y\)
\(\Rightarrow 2x=\color{green}{(x+2)}+3\)

Do you follow so far?

Answer 11

yes @Algorithmic

Answer 12

So can you continue from where I left of at?

Answer 13

i can try @Algorithmic

Answer 14

Okay try, from where I left off.

Answer 15

so you would have to put the 2 on the other side of the number @Algorithmic

Answer 16

Well first let us condense (combine likes terms) in our equation.
\[2x = x + 5\]

Did you see how I did that?

Answer 17

you added 3+2 right

Answer 18

Correct, now to isolate variable \(x\).
\[2x = x + 5\]
\[\Rightarrow 2x - x = 5\]
\[\Rightarrow x = 5\]

Do you understand?

Answer 19

i think i understand a lil bit @Algorithmic

Answer 20

Okay, so we know now that \(x = 5\).

We can now use that in our first equation to get \(y\).

\[x + 2 = y\]
\[\Rightarrow 5 + 2 = y\]

Answer 21

so plug in 5 in the x

Answer 22

Correct, and you get \(y\).

So now you have both the values for \(x\) and \(y\).

Answer 23

thanks a lot and do you have a kik

Answer 24

You are welcome.

No I do not have a Kik.

Answer 25

ok