Ix- y=7
x- y=-4
Graphing

Each pizza must be divided into 6 parts.   TRUE

Mario can feed 12 friends with 4 pizzas.  TRUE

Step-by-step explanation:

Total number of pizzas Mario has  = 4

Now the fraction of pizza eaten by 1 friend  = 2/6 = 1/3

⇒ 1 friend eats of pizza.

So, the fraction if pizza eaten by his 3 friends  = 3 x Fraction his 1 friend eats)

Hence, his 3 friends eats 1 complete pizza.

Now, he has a total of 4 pizzas.

So, the number of friends to finish 4 pizza  

= 4 x ( Number of people to finish 1 pizza) = 4 x 2  = 12 friends

Hence, his 12 friends eat 4 complete pizza.

Now, the given statements are:

Each pizza must be divided into 4 parts.

False as 3 is NOT divisible by 4

Each pizza must be divided into 6 parts.   TRUE

Mario can feed 12 friends with 4 pizzas.  TRUE

Mario can feed 24 friends with 4 pizzas. FALSE