Answer: C. 
Step-by-step explanation:
When the coefficient gets larger, the graph will stretch more, getting closer to the y axis.
Answer:
I can't show you BC I need paper to show u sorry
J=john
m=mary
j is 2 times as old as mary
j=2 times m
sum is 21
m+j=21
find mary
subsitute
j=2m therefor subsitute 2m for j
m+2m=21
add like terms
3m=21
divide by 3
m=7
mary=7
*HOPE I HELPED!*