Answer:
Step-by-step explanation:
U need to think
Answer:
It appears to be substitution
Step-by-step explanation:
I think you are talking about system of equations
I'm pretty sure its 100 because if she gave each of her 19 students 5 invitations that equals 95. (19×5=95) And She had 5 leftover equals 100. (95+5=100)