8*3-5*25+8
24-125+8
-93
If linear functions are not parallel, they cross over because if graphed, they will intersect at one area.
it's the last one, because the equation is b=w+6, right? so if the number of weeks is one, the number of books is 7. If the number of weeks is two, the number of books is 8. 8 is not double 7 and therefore the answer is the last option.
approx. 16373 days and around 15 hours
well, if y=18x-7, we can substitute that value into the first equation to get 3x-90x+35=15. Therefore, -87x=-20 and x=$$20/87$$. Therefore, y=18(20/87)-7. y=1586/87-7 and then y=959/87.
