Find point p that divides segment ab from a(3,-2) to b(1, -5) into 2: 1 ratio

How do you determine if an ordered pair is a solution to a given equation?

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?

Solve the formula ax+ by = c for x.