I Which is the best type of graph to show the kilograms of g

I. Which is the best type of graph to show the kilograms of garbage and kilograms of recycling produced by four different schools?

II. The sum of two numbers is 15. The difference of the two numbers is 9. What are the two numbers?

no graph given to chose

you can use double bar graph to show the kilograms of garbage and kilograms of recycling produced by four different schools

II)

let the 2 numbers be x , y .and x is larger one.

The sum of two numbers is 15

=>x+y=15

The difference of the two numbers is 9

=>x-y=9

add both equations

x+y +x-y =15+9

=>2x=24

=>x=24_/2

=>x=12

we have x+y=15 , x=12

=>12+y=15

=>y=15-12

=>y=3

the two numbers are 12 and 3