Easy Algebra Question: A 9th grade math class has 27 students. There are twice as many girls in this class as there are boys. Write an system of equations that could be used to model this situation. (WILL FAN AND MEDAL ;))

Question

hysusonic · Answer

so do you know what you can do?

anonymous · Answer

Not really

hysusonic · Answer

well first throw out the useless information and keep the useful things such as the total amount of students and how many boys there are to girls

hysusonic · Answer

27 students
twice as many girls than boys

hysusonic · Answer

you with me so far?

anonymous · Answer

Yes

hysusonic · Answer

okay so you know you your answer has to add up to 27 and you have 2 variables, what can you make with this?

anonymous · Answer

divide something ?

hysusonic · Answer

nope add the 2 variable which would make x+y=27

anonymous · Answer

Ok

hysusonic · Answer

so we have our first system

anonymous · Answer

Right

hysusonic · Answer

do you know how to get the second one?

anonymous · Answer

No

hysusonic · Answer

well we would have to find the y-value (the number of girls)

anonymous · Answer

Ugh I have no idea how to do this

hysusonic · Answer

so you set an equation to Y which would be x+x=y or 2x=y

anonymous · Answer

ok

hysusonic · Answer

wait no i'm confused now... whoops sorry this is where i have to leave you but maybe @misty1212 or @Awolflover1 can help

mathstudent55 · Answer

The first equation is 
x + y = 27
For the second equation, there are twice as many girls (y) as boys (x), so you write:
y = 2x

Now you have a system of equations:
x + y = 27
y = 2x