Do Now 10/17/11Do Now 10/17/11

Take out HW from Friday.Take out HW from Friday. Punchline worksheet #38Punchline worksheet #38

Copy HW in your planner.Copy HW in your planner. Text p. 74, #4-6, 14-19, 22-34 evens, 43, 44, 48, & 49Text p. 74, #4-6, 14-19, 22-34 evens, 43, 44, 48, & 49 Quiz on equations Friday.Quiz on equations Friday.

Be ready to copy Problem of the Week #6.Be ready to copy Problem of the Week #6.

HomeworkHomeworkPunchline worksheet 38Punchline worksheet 38

““What Do Opticians, Optometrists, What Do Opticians, Optometrists, and Opthamologists Have In and Opthamologists Have In

Common?”Common?”

THEY ALL WENT TO EYE SCHOOLTHEY ALL WENT TO EYE SCHOOL

ObjectiveObjective SWBAT use multiplication and

division to solve equations

Equation-mathematical sentence with an equal sign

Like a scale, both sidesmust be balanced

Equation

Like a scale, the Like a scale, the left side and right left side and right side must be the side must be the same in order to be same in order to be balanced!balanced!

2 = 102 = 10Left side Right side

xx

‘‘x’ has to be 5 in order x’ has to be 5 in order to make the equation to make the equation balanced.balanced.

Section 2-5 “Solving Equations Using Multiplication and

Division”

How can you get the “unknown” by How can you get the “unknown” by itself?itself?

““Undo” the operation by using the Undo” the operation by using the INVERSE operation to both sides of the INVERSE operation to both sides of the equation.equation.

-2y = 28-2y = 28

Solving a Multiplication Solving a Multiplication EquationEquation

-2y = 28 -2 -2-2 -2

y = -14y = -14

““Undo” Undo” multiplicationmultiplication by dividing by dividing

both sides of the both sides of the equationequation

Check Your Work!

-2y = 28-2y = 28y = -14y = -14

-2(-2(-14-14) = 28) = 28

Are both sides equal?Are both sides equal?

Try It Out

1). -7t = 63

2). -144 = 12d

3). 10x = 5

1). t = -9 -7(-9) = 63 2). d = -12 -144 = 12(-12) 3). x = ½ 10(½) = 5

Solving a Division Equation

j = -7 555·· ·· 5 5

j = -35j = -35

““Undo” Undo” division by division by multiplying multiplying

both both sides of the sides of the

equationequation

Check Your Work! j = -75

j = -35j = -35

Are both sides equal?Are both sides equal?

-35 = -7 5

Try It OutTry It Out

1). r = -16 -16 ÷ 8 = -2

2). v = 3232 = 8

4

3). a = -45 -9 = -45

5

1). r ÷ 8 = -2

2). v = 8 4

3). -9 = a 5

Find the width of the Find the width of the rectangle.rectangle.

Area = 38 cmArea = 38 cm²²

xx

22

Area = 27 mArea = 27 m²²zz

99x = 19 cmx = 19 cm

z = 3 mz = 3 m

2x = 38 cm2x = 38 cm²²

9z = 27 m9z = 27 m²²

HomeworkHomework Text p. 74, #4-6, 14-19, 22-34 evens, 43, 44, 48, & Text p. 74, #4-6, 14-19, 22-34 evens, 43, 44, 48, &

4949

2424

WAR!!!WAR!!!Using your boards Using your boards

solve the equations as fast solve the equations as fast as possible. If your as possible. If your number is called … you number is called … you are at WAR!!are at WAR!!