Question

Hi, I am looking to learn Linear equations with 2 variables, I do not understand the concept. Can someone please help? Thanks

Answer 1

Hi antjojo2009 :)

How are you? :)

Answer 2

Which concept regarding with this equation is not clear to you dear?

Answer 3

Hi good

Answer 4

I am not understanding how to work 2 variable linear equations

Answer 5

I am going for dinner. Until I come back, if you wait then I will help you thoroughly or if you want then you can bump it. Please let me go now then I will be back.

Answer 6

Until post your all problem.

Answer 7

MAy i help? @Shayaan_Mustafa

Answer 8

Yes saifoo.khan. Please. thanks

Answer 9

saifoo.khan will help you thoroughly. Good luck guys. Thanks once again. tc

Answer 10

@antjojo2009 are u still here?

Answer 11

Let me write things out. @antjojo2009

Answer 12

Hi any help would be great

Answer 13

Well when we have equations with 2 variables we are basically looking for the value of each.

Let's say if we are given, 5 caps and 2 watches cost 13 dollars.
And 1 cap and 2 watches cost 9 dollars.

Answer 14

still here

Answer 15

Now we are going to make two equations,
let's suppose caps as x and watches as y.
we can rewrite as,

5x + 2y = 13 -equation 1
1x + 2y = 9 -equation 2.

Answer 16

Now we can solve both equations to get the value of x and y. therefore, giving us the value of each cap and each watch.

Do you understand?

Answer 17

yes, i understand.
The problem I am having is coming up with the answer

Answer 18

Ok, you may post your problem. i will explain it.

Answer 19

y=5x+1
5y+4=7x

Answer 20

Do you know about substitution method?

Answer 21

not really

Answer 22

umm, okay. in substituion method, we take one equation and make it the subject and then insert the value into another equation to solve for it, let me show you.

Answer 23

y=5x+1 -equation 1
5y+4=7x -equation 2

Equation 1 has "y" as subject , so we can ignore the first step.
in step 2, we will insert the value of y in another equation (equation2)

5y + 4 = 7x
Now replace y with the value of y in equation 1.
5(5x+1) + 4 = 7x.

Do you copy till here?

Answer 24

oh okay, yes

Answer 25

Cool, now solve the equation:
5(5x+1) + 4 = 7x.
25x + 5 + 4 = 7x
after solving we willl get,
x = -1/2

Got it?

Answer 26

ok thanks a bunch

Answer 27

Hey! there's 1 more step left.

Answer 28

Now after you have the value of x.
insert that value into any equation you like to get the value of y.

Let me insert it into equation 1,
y=5x+1
y = 5(-1/2) + 1
y = -5/2 + 1
y = -3/2

Answer 29

ok