Solving Systems of Equations by Substitution Quiz

What is the first step in solving a system of equations by substitution?

• Add the equations together

• Graph the equations

• Isolate one variable in one of the equations

• Multiply both equations by a constant

In problem 15, what is the value of x after solving the system?

• -2

• 2

• -3

• 3

For problem 16, what is the expression for y in terms of x?

• y = 2x + 20

• y = -2x - 20

• y = -2x + 20

• y = 2x - 20

What is the solution for x in problem 16?

• x = 5

• x = 6

• x = 7

• x = 8

In problem 17, what is the value of y after solving the system?

• y = 2

• y = 1

• y = 3

• y = 4

What is the expression for x in terms of y in problem 18?

• x = -3y + 3

• x = 3y - 3

• x = -3y - 3

• x = 3y + 3

In problem 18, what is the final solution for y?

• y = 4

• y = 3

• y = 2

• y = 1

For problem 19, what is the expression for x in terms of y?

• x = 7/2y + 17/2

• x = 7/2y - 17/2

• x = -7/2y + 17/2

• x = -7/2y - 17/2

In problem 20, what is the final value of x?

• x = 4

• x = 3

• x = 5

• x = 6

What is the final solution for y in problem 20?

• y = 1

• y = 4

• y = 2

• y = 3