X-z=-3 y+z=9
y+z=7

A. x= 2, y= 4, z= 5
B. x= 7, y= 9, z= 0
C. x= 0, y= 2, z= 7
D. x= -2, y= 14, z= -5

that is impossible

Step-by-step explanation:

because you have 2 equations where y+z equal different numbers

question: how many people can she serve?

answer: she can serve 16.66666667 people. so she can only give 16 people a complete serving.

question: does she have enough ice cream for her guests?

answer: no. explanation: she only has enough for 16 people to have a full serving. however, she can give a 17th person a partial serving.