My homework asks: Create an example equation in one variable for each of the following types of solutions: A.) one solution
B.) Infinitely Many solutions
C.) no solution

My question is how would we know how to create one of these equations? my teacher never discussed this.

Simplify the expression. -2/5(10+15m-20n)

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10