Your answer is A. You literally plug in the numbers for a and b to solve for the equation.
Answer:
infinite
Step-by-step explanation:
Let the linear equation in two variables be ax+by+c=0
Put values


Hence for any values it has infinite number of solutions .
including x=1 and y=3
Answer: A: the possible income from producing an additional item.
Step-by-step explanation: The actual definition of marginal cost is the cost added by producing one additional unit of a product of service.
There is only 1 real number solution