If 4 blocks weigh 28 ounces how many blocks weigh 70 ounces

What is the equation of the line shown in this graph?

Write a linear funtion f with the values f(2)=-1, and f(5)=4

Awater truck is filling a swimming pool the equation that represents this relationship is why equals 19.75 x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool