Algebra
posted by Amber on .
Your teacher is giving you a test worth 100 points containing 40 questions. There are 2point and 4point questions on the test. How many of each type are there.
dealing w/subst. and elimin.

let number of 2 pointers be x, then number of 4pointers is y
so x+y = 40
2x + 4y = 100
take it from there