Martha has 3 cards but she wants to make more. if she makes 5 cards an hour. how many cards win she have after 6 hours i

Just do 5x6 because 5 cards an hour and u multiply by 6 because of the hours and so your answer will be 5x6=30

Make an equation in the form of y=mx+b
b is the number of cards that she started with, because if x=0, the number of hours is zero, then she would have the number of cards she has now.
y=mx+3
M is the rate of change, how many cards she makes in one hour, which is 5.
y=5x+3
Now, find the number of cards after 6 hours
y=5(6)+3
y=30+3
33 cards

Hope this helps :)