Question

You have a coupon worth $18 off the purchase of a scientific calculator.The calculator is also being offered at a discount of 15% off. You can only use either the coupon or the discount, but not both.Write a linear equation to represent using the coupon.Use x for the cost of the calculator And y for the cost after the coupon.

Answer 1

The linear equation representing cost after using coupon is
`y=x-18`.

Explanation:

Given:

Value of coupon = $18

Let the cost of the calculator be 'x'.

And the Cost after redeeming the coupon be 'y'.

We need to write a linear equation to represent using the coupon.

Solution:

Now we can say that;

Cost after redeeming the coupon will be equal to cost of the calculator minus Value of coupon.

framing in equation form we get;

`y=x-18`

Hence The linear equation representing cost after using coupon is
`y=x-18`.