Question

The cost of jackets is proportional to the number of jackets bought. Mr. Jackson bought 9 jackets and paid a total of $540. Write the equation which can be used to find the total cost, y, for any number of jackets, x, bought?

Answer 1

This is the concept of algebra, we are required to find the equation relating the total cost of jacket,y , for any given number of jackets,x , bought.

From above we are told that 9 jackets cost $540. the cost of one jacket will be:

cost=[total price]/[number of jacekts]
=540/9=$60
the total price is given by:
total cost=[number of jackets]*[price of one jacket]
thus;
total cost=y
number of jackets=x
price of one jakcet=$60

thus;

y=60x

the equation of finding the total cost, y, of any number of jackets, x, is:
y=60 x