Section 2-2 Solving using addition and subtraction - Flash (Medium) - 20120112 09.34.20AM
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Solving Equations using Addition and Subtraction
Example #1 Solve each equation. SHOW ALL WORK!
Example #2 write an equation for each sentence, and then solve the equation. SHOW ALL WORK!
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Solving
Equations
using
Addition
and
Subtraction
Things
to
remember
about
solving
equations:
The
goal
in
solving
equations
is
to
undo
the
equation-get
the
variable
by
itself.
Addition
and
Subtraction
“undo”
each
other-
they
cancel
each
other
out.
Whatever
you
do
to
one
side
of
the
equation,
you
must
do
to
the
other
side.
All
work
must
be
shown.
Example
#1
Solve
each
equation.
SHOW
ALL
WORK!
h
-
12
=-27
+12
+12
h
=
-15
k
+
63
=
92
-
63
-
63
k
=
29
c
+
102
=
36
-102
-102
c
=
-66
y
–
4/5
=
2/3
y
–
12/15
=
10/15
+
12/15
+12/15
y
=
22/15
y
=
1
7/15
x
–
(-6)
=
54
x
+
6
=
54
-6
-6
x
=
48
-18
=
w
+
(-12)
+12
+12
-6
=
w
g.
19
=
k
–
(-25)
19
=
k
+
25
-25
-25
-6
=
k
Example
#2
write
an
equation
for
each
sentence,
and
then
solve
the
equation.
SHOW
ALL
WORK!
Fourteen
more
than
a
number
is
equal
to
twenty-seven.
14
+
n
=
27
-14
-14
n
=
13
Twenty-five
is
3
less
than
a
number.
25
=
n
–
3
+3
+3
28
=
n