Amelia is going to buy some cards for her friends. each card costs $3.she finds a coupon for $2 off the entire purchase. write an equation that shows the number of cards purchased, x, and the total cost, y.

y = ( 3 * x ) - 2.

This is because the card costs for 3 $ and should be multiplied by the number of total cards she buys in that particular day. So 3 * x.

Now as she has got a 2$ off coupon, whatever the total is she gets 2 dollars off on that price. So we will subtract 2 at that time. FInally all this summed up would be equal to y.

the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap