Lesson 1: Solving equations with variables on one side.

.

• $x=21$

• $x=-21$

• $x=18$

• $x=-13$

.

• $x=4$

• $x=-4$

• $x=6$

• $x=-8$

.

• $x=2$

• $x=-4$

• $x=9$

• $x=11$

Which number do you cancel first? and what is the value of x?

•  $First\ cancel\ the\ -\ 1.\ The\ value\ of\ x=30$  

•  $First\ cancel\ the\ -12.\ The\ value\ of\ x=22$  

•  $First\ cancel\ the\ 3.\ The\ value\ of\ x=-9$  

•  $Cancel\ any\ number,\ the\ order\ doesn't\ matter.\ The\ value\ of\ x\ =\ 2$   $x=13$  

Which method is correct?

• (3x-1)+7=42

  (3x-1)=35

  3x=36

  x=12

• (3x-1)+7=42

  (3x-1)=49

  3x=50

  x=12

Which statement is true? What is the value of x?

• To cancel the factor 2/3 we can multiply both sides of the equation by its reciprocal 3/2. The value of x=6

• To cancel the factor 2/3 we can multiply both sides of the equation by -2/3 The value of x=6

• To cancel the -8 we can subtract 8 on both sides. The value of x=-6

Which method of solving is correct?

• (-2x+1)+7=2

  (-2x+1)=-5

  -2x=-6

  x=3

• (-2x+1)+7=2

  (-2x)+7=1

  x+7=1/2

  x=3

What is the value of x?

• x=24

• x=12

• x=-6

• x=-18