a 9 grade math class has 27 students there are twice as many girls in this class as there are boys.write a system of equation that could be used to model this situation
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
