Algebra word problem help

Question

 

The variable Z is directly proportional to X. When X is 10, Z has the value 190.

What is the value of Z when X = 13

 

 

The variable Z is directly proportional to X. When X is 3, Z has the value 18.

What is the value of Z when X = 13

 

 

Answer 1

Z=kX

190=k*10

k=190/10=19

Z=19X

Z=19*13

Z=247

 

Z=kX

18=k*3

k=18/3=6

Z=6X

Z=6*13

Z=78