Don't know try something else it will probably help
Answer:
Let the no. of messages Jina send be x.
No. of messages Kevin send=x-5
No. of messages Chang send=3(x-5)
=3x-15
x+(x-5)+(3x-15)=130
x+x-5+3x-15=130
x+x+3x-5-15=130
5x-20=130
5x=130+20
=150
x=150÷5
=30
No. of messages Jina sent=30
No. of messages Kevin sent=30-5
=25
No. of messages Chang sent=3(30)-15
=90-15
=75
Answer:
is not a function
Step-by-step explanation:
Given




Required
Which is not a function
A function is of the form 
Assume a function is:

In simple terms:
For an ordered pair to be regarded as a function, no x value must be repeated
Analyzing the options:
1. 
This is a function because none of the x values (-3, 8, 0 and -9) appeared more than once
2. 
This is a function because none of the x values (5, -3, 0 and -9) appeared more than once
3. 
This is a function because none of the x values (9, -5, 5 and 6) appeared more than once
4. 
This is not a function because one of the x values (2) appeared more than once.
i.e.
and 