What’s the missing number in the table ?

Aline passes through 3,7 and 6,9 what equation represents the line

What is the equation of a line passing through (-6,5) and having a slope of 1/3

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?