In 2015, the price of a business math text rose to $150. this is 8% more than the 2014 price. what was the old selling price?

old selling priceof businesss math text rose = $138.89

Explanation:

In year 2015, Price of business math text rose = $150

Suppose privious price (year 2014)= x dollars

Previous price is 8% less than the price in 2015 because given that $150 is 8% more than previous year price.

Now write the linear equation for the given information:

x + 8% of x = 150

Solve for x

x + x = 150

x + 0.08x = 150

1.08x = 150

divide 1.08 both the side

x =

x = $138.89

Old selling price = $138.89

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

it's a proportional graph.

step-by-step explanation:

8 x 5 = 40         (and you have -8x and -5y)

x= absiss

y= orderly

so you have a proportional graph.