Transcript Solve Equations with Multiplication and Division

Objective
The student will be able to:
solve equations using multiplication and
division.
Designed by Skip Tyler, Varina High School
1) Solve. -5t = 60
To get the variable by itself, which
number needs to be moved?
-5
-5t means that -5 and t are being
multiplied.
To move the -5, you have to do the
opposite operation.
What operation will we use?
division
1.
2.
3.
1) Solve -5t = 60
-5 -5
Draw the line to
t = -12
separate the equation
into 2 sides
Divide both sides by -5
Simplify
1.
2.
3.
2) Solve 15 = 6n
6
6
Draw the line
Divide both sides by 6
2.5 = n
Simplify
3) Solve -3v = -129
1.
2.
3.
4.
v = -126
v = -43
v = 43
v = 126
Answer Now
x
 12
4) Solve
4
What number do you need to get rid of to
get the x alone?
It is being divided. What are you going to
do to get rid of the division?
1.
2.
3.
x
4) Solve  12
4
Draw the line
x
Multiply both sides by 4
4 ·  12 · 4
Simplify
4
x = -48
1.
2.
3.
x
 10
4) Solve
6
Draw the line
x
Multiply both sides by -6
-6 ·  10 · -6
6
Simplify
x = -60