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Oni’s school went on a field trip to the zoo. They took 3 buses and 2 vans for a total of 118 students. On another trip they took 1 bus and 7 vans to transport 128 students. How many students rode each van and each bus ?

Respuesta :

X= bus Y= van

3x+2y=118
X+7y=128

Multiply the bottom row by -3

3x+2y=118
-3x-21y= -384

-19y=-266
Y=14. 3x+2(14)=118
3x+28=118
3x= 90
X=30

Answer:

14 students rode in a van and 30 rode in a bus.

Step-by-step explanation:

Let the number of students who rode on Β a van = v and the number on a bus be b.

Then we have the system of equations:

3b + 2v = 118

b + 7v = 128 Β 

Multiply the second equation by 3:-

3b + 21v = Β 384

3b + 2v =118 Β  Subtract:-

19v = 266

v = 14.

Now substitute v = 14 in the first equation

3b + 2(14) = 118

3b = 90

b = 30.

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