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September 2, 2014

September 2, 2014

Posted by **ava** on Monday, January 13, 2014 at 10:51am.

thanks

- math -
**koala**, Monday, January 13, 2014 at 11:03amIt's a system of equations

Let's say that students = x,and that adults = y

Now let's construct the system of equations:

x + y = 30

3x + 5y = 98

Let's work by substitution with the first equation:

x = 30 - y

Lets the expression above in the second equation:

3(30-y)+5y=98

Now we solve for y:

90-3y+5y=98

-3y+5y=98-90

2y=8

y = 8/2

y = 4

So we said that y represent the number of adults, so we have 4 adults.

30-4= 26 students

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