Amir wants to scale up a photo to create a poster for his room. the original picture is 6 inches in width and 4 inches in height. what will be the height of the poster if its width is 30 inches?

So 6 in.w x 4 inches in.h
what will it be 30 inches wide

what we are doing right now is putting height over width, then the same thing to the other height over the width
now we cross multiply
(4) (30) = (6)(x)
120 = 6 x
divide both sides by 6 to isolate the variable
20 = x
The height of the poster, that has the width of 30 inches, will be 20 inches

Hope this helps :)

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The answer simplified would be. -6300x