38 problems on a test worth a total of 100 points.
each test problem is either worth 5 points or 2 points .
how many 5 point questions and 2 point questions
okay, so you let number of 5 point problems
then you let the number of two point problems
since you have two variables you need two equations that are related
and
then you can say that and you can substitute that value in for y, so
and
then solve for y