Assignment 1.3
Solving Equations
Solve each equation. Check your solution.
x – 6 = -20
+6 +6
x = ___
-20+6= ___
_2
3 a = 14
-3
2
-2
3a = 14 x -3/2
14 x -3/2 =
a=
7 + 5n = - 58
-7
-7
5n = -65
5
5
-58 – 7 = -65
-65 ÷ 5 =
n=
3w + 14 = 7w +2
-3w
-3w__
14= 4w +2
-2
-2
12
4
= 4w
4
7w -3w = 4w
14 -2 = 12
12 ÷ 4 =
= w
Closed last step Strategy
Assignment 1.3
Solving Equations
n+n = 1
4 3 2
12(n/4 + n/3) = ½ (12)
12 ÷ 4 = 3n
12 ÷ 2 =
6
12 ÷ 3 = 4n
3n
+
4n
__________
7
=
7n
=
7
n=
5y + 4 = 2(y-4)
5y + 4 = 2y + -8
- 2y
- 2y
3y +4 =
-8
-4 -4
3y
3
= -12
3
2 x y = 2y
2 x -4 = -8
-8 + -4 = -12
12 ÷ 3
=
y =
Closed last step Strategy
Assignment 1.3
Solving Equations
MONEY
If Tabitha has 98 cents and you know she has 2 quarters, 1 dime, and 3 pennies, how many nickels does
she have?
.98 = ( 2 x .25 ) + (1 x .10) + (3 x .01) + ( n x .05)
.98 =
0.50
+ 0.10
0.50
+ 0.10
+
+
0.03
= .05n
.05
.05
÷
.05n
0.03 = 0.63
.98 = 0.63 + .05n
-0.63
-0.63
.35
+
.98 - 0.63 =
=
n=
She has
nickels.
Closed last step Strategy
.35
Assignment 1.3
Solving Equations
Solve each equation or formula for the specified variables.
Ax + By = C
-By -By
for x
Ax = C-By
A
A
x = _____
a – 4b2
2c
2c
d
for a
a – 4b2 = d x 2c
2c
a-4b2 = 2cd
+4b2 +4b2
a = ___ + ___
A = p + prt for p
_A_ = p(1 + rt)
1 + rt = 1 + rt
__ = p
_____
Closed last step Strategy
Assignment 1.3
Solving Equations
d = b2
–
2
d = b
b2
4a
c
4a
c
for c
b2
=4a
-
Closed last step Strategy
4a
Assignment 1.3
Solving Equations
GEOMETRY
Alex wants to find the radius of the circular base of a cone. He knows the height of the cone is 8 inches
and the volume of the cone is 18.84 cubic inches. Use the formula for volume of a cone, V = 1/3r2h, to
find the radius.
V = 1/3r2h
3 x 18.84 = 1/3r2(8) x 3
3 x 18.84 = 56.52
56.52 = r2(8)
(8) (8)
56.52 = r2
(8)


56.52
 (8)
 (8)
r
2
r
Closed last step Strategy