The scatter plot shows the number of pizzas sold during weeks when different numbers of coupons were issued. The equation represents the linear model for this data.

y = 3.4x + 43

What does the number 3.4 in the equation mean in this context?

There were 3.4 pizzas sold and 3.4 coupons issued every night.

The number of coupons issued in 6 days was 3.4.

There were 3.4 coupons issued each night.

There were 3.4 pizzas sold for every coupon issued.