Trial and error on this one try each pair till you find negative slopes
C and D
C. 5 packs of pencils and 3 packs of erasers. it is c because no matter what 20(the pack of erasers) is multiplied by it will always end in a zero, therefore you would have to multiply 12 by a number that would make it a multiple of 20 as well which happens to be 5. 5×12=60 and 3×20=60
I need help my self lol XD sorryyyyyyyyy88898
130 i think let me know if this is right