Ok, I finally fuigred it out its 17+17+17+17+16+16 because 17*4 is = to 68 and 16*2 is = to 32, 68+32 equals to 100!
Answer:
(13/2,-5/2)
Step-by-step explanation:
I hope this helps
His mistake was adding 12+2 when he was supposed to subtract.