Wouid someone explain this Explain, how did we know x + 20 = 3x - 40? Thank you

Asystem of linear equations contains two equations with the same slope. select all of the correct statements. i a. the system may have two solutions. - b. the system may have infinitely many solutions. c. the system may have one solution. o d. the system may have no solution. submit

How are algebraic expressions evaluated using substitution?

What are two numbers that have a sum of 15?