Between the two of them, they teach 35 yoga classes each week. if erica teaches 13 fewer than twice as many as bo, how many classes does each instructor teach per week?
Assume x are Erica's classes & y are Bo's classes. x+y=35 x=2y-13 Replacing the value of x into the first equation 2y-13+y=35 3y=35+13 y=16 classes x=2*16-13=19 classes
