Need help macroeconomics

An economy's production possibility boundary is given by the mathematical expression 20 = 4 A + B, where A is the quantity of good "a" and B is the quantity of good "b". [Hint: To help you answer this question, use the formula Y = mX + b and have good "a" quantities correspond to X-axis values and good "b" quantities correspond to Y-axis values.] Part 1: If all the resources in the economy are allocated to producing good "a", what is the maximum level of production for this good Number Part 2: What is the maximum level of production for good "b" Number Part 3: What is the opportunity cost per unit of increasing the production of good "b" Number Part 4: Can the combination of 10 units of good A and 10 units of good B be produced in this economy (yes=1, no=2) Number Part 5: Can the combination of 10 units of good A and 15 units of good B be produced in this economy (yes=1, no=2) Number