Substituting Values into Equations

Solve the equation: 
x + 7 = 12

• x = 5

• x = 19

• x = 4

• x = 84

Solve the equation:
4p = 16

• p = 12

• p = 64

• p = 3

• p = 4

Solve the equation:
2w=58

• w = 29

• w = 32

• w = 15

• w = 116

Solve the equation:
x/3 = 4

• x = 12

• x = 1

• x = 16

• x = 3

You are given the equation
2x + 3y = 6
Substitute the values (3, 0) into the equation. Which equation below shows a correct substitution?

• 2(0) + 3(3) = 6

• 2(3) + 3(0) = 6

• 3x + 0y = 6

• 2(3x) + 3(0y) = 6

When you substitute into an equation that means to ____

• set the equation equal to itself

• keep the variable and add in the expression

• replace the variable with the expression

Find y if x = 7

• 20

• 10

• 11

• -11

Mathematical Equivalence

OFF

y = -2x + 18
y = 8

• (5, 8)

• (-5, 8)

• (2, 8)

• (-2, 8)

Which answer has a correct first step for this system:

• The variable is already isolated, so we've already solved the system.

• The variable is already isolated for y, so we substitute it in the first equation and solve for x

  3x + 3(3x + 5) = 3

• impossible

• The variable is already isolated for y, so we substitute it in the second equation and solve for x

  y = 3(3x + 3y) = 3