Solve an Expression by Substitution

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
2a² + c²   

• 22

• 34

• 68

• 43

Tags

CCSS.6.EE.A.2C

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
3ab

• 10

• 12

• 15

• 36

Tags

CCSS.6.EE.A.2C

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
2a

• 5

• 6

• 8

• 10

Tags

CCSS.6.EE.A.2C

Evaluate -2x  if     x = 10

• -8

• 20

• -20

Tags

CCSS.6.EE.A.2C

Using substitution, what is the correct next step? I am not interested in the answer.

• 3x - 7(-2y-21) = 41

• 3(-2y-21) - 7y = 41

• -2(41-3x) - 21

• (-5,-8)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve this system by substitution.

• (1, -4)

• (1, 4)

• (-4, -7)

• (-7, -4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Find the value of (x, y) that satisfies the equations by solving the system using substitution.
 
5x + 4y= −14
y =  −7x  −  15  The solution is (a)   .

• (-2, -1)

• (0, 0)

• (1, 1)

• (2, 2)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Using substitution, what is the correct next step? I am not interested in the answer.

• 5x - (2x) = 9

• 5(2x) - y = 9

• (3,6)

• (6,3)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Given the following systems of equations, what is the value of y?
y = 2x + 1
y = 4x - 1
Make sure you type your answer as y=

Mathematical Equivalence

OFF

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

a method of solving a system of equations by taking a variable out and replacing it with an expression.

• Systems by Graphing

• Systems by Substitution

• Systems by Elimination

• Systems by Drawing

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6