There is a markup of 40% on the original price of a fan. If the fan was sold for $42, what was its original price

  21$ that is the answer

Step-by-step explanation:

y = 5x + 4

Step-by-step explanation:

Its a given that the y intercept is 4 because on that point x = 0

B= 4

now you solve for your slope using y - y' / x - x'

when you plug in the numbers you get -1 - 4 / -1 - 0 which simplfies to -5 / -1 which simplifies just to 5, so we know the slope is = 5

now we just plug In and the base equation is y = mx + b.