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
