What is the step. some help

Of four points are collinear, they are also coplanar

Beth took out a $20,000 loan for college she is borrowing money from two banks. bank a charges an interest rate of 8.5% bank b charges and interest rate of 10.5% after one year alice owes $1860 in interest how much money did she borrow from bank a

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.