Question

by substitution -x/6 + y/2=1/2
x/3-y/6=-3/4

Answer 1

just get the value of x from one and put into another u will get y

Answer 2

I think it becomes simple if we multiply 12 with both the equations first and then evaluate x or y for substitution..

Answer 3

can u show me how waterineyes?

Answer 4

Ditto to what @waterineyes said. Multiply EACH term by 12.

Answer 5

Equations will become:

-2x + 6y = 6
4x - 2y = -9

Now, evaluate x or y here..

Answer 6

how?

Answer 7

Multiply EACH term in the top row that @waterineyes gave you by 2. Then add like terms to eliminate the x.
-4x + 12y = 12
4x - 2y = -9
__________________
0x + 10y = 3

So y = 3/10...plug that into ONE of the equations in order to solve for x.

Answer 8

thanks @coreylvaughn

Answer 9

You should be able to take it from there...

Answer 10

@coreylvaughn we have to do it by substitution and not by elimination..

Answer 11

No problem. Thank @waterineyes

Answer 12

how to do it @waterineyes

Answer 13

Ewwww...my apologies. Well at least now you know what y SHOULD come out to be once you've performed all substitutions.

Answer 14

Pick one row. ONE row. And solve for ONE variable (i.e. get that variable ALONE)

Answer 15

Plug whatever expression you get for that variable, into the SAME variable in the OTHER row.

(Note: row = equation)

Answer 16

Firstly divide by -2 in the first equation:
we will get:

x - 3y = -3

So, x = 3y - 3

Put it in second:

4(3y - 3) - 2y = -9

12y - 2y = -9 + 12

10y = 3

y = 3/10


Now for x:

x = 3y - 3

x = (9/10) - 3

x = -21/10

Answer 17

Thanks @waterineyes now I can solve some of the equation here

Answer 18

Welcome dear...

Answer 19

@waterineyes have a question in x dear?

Answer 20

x=3y-3 right? and y= 3/10?

Answer 21

I got it now. Thanks dear

Answer 22

Yes..

Answer 23

got it dear... Thanks a lot!

Answer 24

Sorry I was busy in something else..

You got y = 3/10

and you have x = 3y -3

to find x just put the value of y here..

Answer 25

Welcome dear..