Question

3rd and 4th one too plzzzzzzz (substitution or elimimation) plz fast

Answer 1

Let the number of hikers be x and the number of bikers be u
From the question, we can form two equations...
First..... x= 178+y
Second... x+y= 676
Substitute First equation in second equation,,
178+y+y= 676
178+2y= 676
2y= 498
------»» y = 249
Therefore the number of bikers are 249.

Substitute y in first equation,
x= 178+249
------»» x = 427

Therefore the number of hikers are 427