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.

The linear equation representing cost after using coupon is .

Step-by-step 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;

Hence The linear equation representing cost after using coupon is .

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