Someone me solve this i forgot how to do this type of

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?

Janice determined there were 10 possible outcomes when tossing two coins and spinning a spinner numbered 1 through 6. what is the correct number? what might have been janice's error?