Abookstore advertises 5 notebooks for $7.50. at this rate, how much would 8 notebooks cost

Well first you need to divide 7.50 by 5 . You get 1.50 so then you multiply 1.50 by 8 & get $12

Hi!

The answer would be $12 , because if we multiply 7.50 by 8 we get 60 and when we divide that by 5 we get 12.

8 notebooks would cost $12

Proportion :
5 nb/8 7.50/x

Cross multiply
7.50 times 8=60
60 divided by 5=12

I’m going to infer you said parallel.solve for yy= -1/2x+7/4lines that are parallel have the same slope, different y intercept.so we know m is -1/2then from there solve for y intercept.