If y=-4 when x=10,find y when x=45

Question

the question is exactly how I saw it on my sheet of paper,excuse me if i missued pronounce anything.

Answer 1

Is this another y = mx problem?  They are are solved similarly.  If you are given an (x,y) point, use that to get m.

 

m = y/x

 

Then knowing m, find a new y at a different x.

 

y = mx

 

I will work this one for you, but you should be able to do the rest now.

 

-4 = m(10)

 

m = -4/10 = -2/5

 

y = (-2/5)x

 

(-2/5)(45) = -18

 

y = -18 at x = 45.