Transcript Solving 2-Step Variable Equations

Solving 2-Step Variable
Equations
What??? I just learned 1-step!
Relax. You’ll use what you already know
to solve 2-step equations.
So, what’s first?
You need to break up the equation into its
two steps.
STEP 1
The first step will always be either adding or
subtracting.
STEP 2
The second step will always be either
multiplying or dividing.
Ex. 1: Let’s try a problem.
This
problem has
addition, so
we need to
subtract
first.
8x + 5 = 61
-5 -5
8x
= 56
Whatever
we do on
one side,
we have to
do on the
other.
Now, Step 2.
This problem
has
multiplication,
so we need to
divide now.
8x = 56
8
8
x = 7
Whatever we
do on one
side, we have
to do on the
other.
Ex. 2: Let’s try another problem.
This
problem has
subtraction,
so we need
to add first.
3a - 8 = 4
+8 +8
3a
= 12
Whatever
we do on
one side,
we have to
do on the
other.
Now, Step 2.
This problem
has
multiplication,
so we need to
divide now.
3a = 12
3
3
a = 4
Whatever we
do on one
side, we have
to do on the
other.
Now you try some problems.
Copy these problems onto a piece of paper.
Break each problem into 2 parts to solve.
Show all your work!
1. 7f + 5 = 40
2. 12t – 6 = 90
3. 5q – 7 = 13
4. 4y + 8 = -12
More practice
• 1. 5x - 5 = 25
2. 19 = 3x + 7
• 3. -5x + 23 = 8
4. 17 = 7 + 8y
• 5. -4 = -5n + 6
6. 18 = -12 – 5z