The equation shows that the cost if one small box is $7 and the large box is $14.
The equation to solve the question will be:
12s + 4l = 140
3s + 12l = 189
Multiply equation i by 3
Multiply equation ii by 12
36s + 12l = 420
36s + 144l = 2268
132l = 1848
l = 1848/132
l = 14
12s + 4l = 140
12s + 4(14) = 140
12s + 56 = 140
s = 7
Learn more about equations on:
brainly.com/question/2972832
#SPJ4