y=2.42x+5.72
x and y are proportional
value of the card in 2003 was $17.82
Step-by-step explanation:
1.
b aka initial= 5.72
m=2.42
this is a linear relationship as it is increasing by the same amount every year
y=2.42x+5.72
2.
x and y are directly proportional as one increases the other increases as well
3. x=number of years since 1998
x=2003-1998=5 years
y=2.42x+5.72 --> substitute x
y=2.42(5)+5.72
y=17.82
value of the card in 2003 was $17.82