solve: x+y=13
4x+2y=13 by substitution or elimination technique

Question

solve: x+y=13
          4x+2y=13 by substitution or elimination technique

slaaibak · Answer

Get one variable in terms of the other one:

x=13 - y

Now plug this x into

4x + 2y = 13

it becomes:

4(13 - y) + 2y = 13

Now just solve it.

anonymous · Answer

I solved to get the x I cant find y

slaaibak · Answer

Once you find x, plug it into x + y = 13 to get the y value

anonymous · Answer

thanks got x=9 y=4

slaaibak · Answer

I think you went wrong somewhere.  I'll help a bit:

By expanding 4(13 - y) + 2y = 13

you get:

52 - 4y + 2y = 13
-2y = -39
y=19.5

x= 13 - 19.5
x= -6.5

anonymous · Answer

this is where I got the equations so I cant get negative numbers. In a farmyard there are only chickens and sheep. There are 13 animals altogether and
between them they have 34 legs. Use simultaneous equations to determine how many
chickens and sheep there are.

slaaibak · Answer

x + y = 13
4x + 2y = 34

You just made a mistake by letting the second equation equal 13 and not 34

anonymous · Answer

oh yeap sorry