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

anonymous · Answer

hey  can you please check this problem  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. same problem not sure if equation are correct

hero · Answer

x + y = 13
2x + 4y = 34

anonymous · Answer

yes

anonymous · Answer

how to solve them

hero · Answer

Same way I solved the other one

anonymous · Answer

but you -7

hero · Answer

You set up that first one wrong then

hero · Answer

Erasing...one minute please

hero · Answer

x + y = 13
2x + 4y = 34

y = 13 - x
y = (34 - 2x)/4

y = y 

4(13 - x) = 34 - 2x

52 - 4x = 34 - 2x

2x = 18
x = 18/2
x = 9
y = 4

hero · Answer

x = chicken
y = sheep

anonymous · Answer

so there are chicken and 4 sheep. how do I prove that their legt

anonymous · Answer

how do I  prove that their legs are correct

hero · Answer

2(9) + 4(4) = 34
18 + 16 = 34
34 = 34

anonymous · Answer

how did

anonymous · Answer

how did you get the number of sheep(4)