Add the following
1/3+3/2
1/4+1/3
1/3+1/5
1/3+2/5
1/4+2/7
1/7+2/3

= 2+9 /6

= 11/6

= 3+4 /12

= 7/12

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

but there’s no any figure there!