Question

Assume that y varies directly with x, then solve

If y=4 when x=12, find y when x=-24

y= ?

Answer 1

if x=12(-2)=-24 then y=4(-2)=-8

multiplicative property of equallity

Answer 2

Well how many 12's are in 24 (forget the negative sing for a moment). Two right? Well that means multiply 4 by 2 and get 8, but where does that negative sign go? Just add it! It makes it so much easier taking it away and then putting it back. That is a trick for this problem. y=-8 while x=-24 Hoped I helped!