Intermediate Algebra
posted by Donna .
if a system has an infinite number of solutions, use setbuilder notation to write the solution set. If a system has no solution, state this.
m  2n = 16,
4m + n = 1

this one is not hard to solve,
mentally double the second equation and add that result to the first one ...
9m = 18
m = 2
mentally sub that into the second equation...
8+n=1
n = 7