Alexander went to the store to buy some walnuts. The price per pound of the walnuts is $8 per pound and he has a coupon for $1 off the final amount. With the coupon, how much would Alexander have to pay to buy 2 pounds of walnuts? Also, write an expression for the cost to buy p pounds of walnuts, assuming at least one pound is purchased.
Final cost of 2 pounds:
Final cost of p pounds:
The cost per pound is $8 and Alexander wants to buy 2 pounds of walnuts. Therefore, the initial price without the coupon would be 8 * 2 = $<<8*2=16>>16.
With a coupon of $1 off the final amount, Alexander would have to pay 16 - 1 = $<<16-1=15>>15.
The expression for the cost to buy p pounds of walnuts is 8p - 1.