Question 836469
Let m be the number of members and n be the number of non-members. We know that 353 people showed up, so m+n = 353. Also, each member paid $2.75 and each non-member paid $6.50, so we have 2.75m + 6.50n = 1762. So we have the following system of linear equations:


m+n = 353
2.75m + 6.50n = 1762


Then you can graph both equations in the mn-plane. However the best way to solve it is likely to use substitution (n = 353-m, substitute).