How would I write the following problem in a Linear equation?

A mom bought 28 packages of Reese’s Cups with 88 total cups. Each king size package holds 4 cups. Each regular size package holds two cups. How many of each size did she buy?

Question

How would I write the following problem in a Linear equation? 

A mom bought 28 packages of Reese’s Cups with 88 total cups. Each king size package holds 4 cups. Each regular size package holds two cups. How many of each size did she buy?

anonymous · Answer

k+r=28
4k+2r=88

amistre64 · Answer

(14+n) + (14-n) = 28

4(14+n) + 2(14-n) = 88

solve for n