One-Step Equations
Solve for b:
-7 = b - 3
b = -4
WORK
-7 = b - 3
-7 +3 = b
-4 = b
Solve for x:
2x + 3 = 15
(When you see it written 2x that means the same thing as 2*x)
x = 6
WORK
2x + 3 = 15
2x + 3 - 3 = 15 - 3
2x = 12
(2x)/2 = 12/2
x = 6
Solve for m:
5 = 5m - 23 + 2m
m =4
WORK
5 = 5m - 23 + 2m
5 = 5m + 2m - 23
5 = 7m - 23
5 + 23 = 7m - 23 + 23
28 = 7m
28/7 = 7m/7
4 = m
Solve for b:
3b - 4 = b + 2
b = 3
WORK
3b - 4 = b + 2
3b - 4 + 4 = b + 2 + 4
3b = b + 6
3b - b = b - b + 6
2b = 6
2b/2 = 6/2
b = 3
Solve:
Five friends equally split a restaurant bill that comes to $32.50. How much does each friend pay?
Each friend pays $6.50.
WORK
5x = 32.50
5x/5 = 32.50/5
x = 6.5 ~~~> $6.50
Solve for x:
x/3 = 2
x = 6
WORK
x/3 = 2
x = 2 *3
x = 6
Solve for a:
2a + 4 = 18
a = 7
WORK
a = 7
Solve for x:
(x + 4) + 2x = 67
x = 21
WORK
(x + 4) + 2x = 67
x + 2x + 4 = 67 [addition is commutative]
3x + 4 = 67
3x + 4 - 4= 67 - 4
3x = 63
3x/3 = 63/3
x = 21
Solve for x:
5x + 2 = 2x + 14
x = 4
WORK
5x + 2 = 2x + 14
5x + 2 - 2 2x + 14- 2
5x = 2x + 12
5x - 2x = 2x - 2x + 12
3x = 12
3x/3 = 12/3
x = 4
Solve:
You work for 4 hours on Saturday and 8 hours on Sunday. You receive a $50 bonus. You earn $164.00 total. How much did you earn per hour?
You earned $9.50 per hour.
WORK
4x + 8x + 50 = 164
12x + 50 = 164
12x + 50 - 50 = 164 - 50
12x = 114
12x/12 = 114/12
x = 9.5 ~~~> $9.50
Solve for x:
5x = 20
(When you see it written 5x that means the same thing as 5*x)
x = 4
WORK
5x = 20
x = 20/5
x = 4
Solve for t:
-t + 8 = 3
t = 5
WORK
-t + 8 = 3
-t + 8 - 8= 3 - 8
-t = -5 [which is the same thing as -1t = -5]
-1t/-1=-5/-1
t = 5
Solve for x:
-8(2x - 1) = 40
x = -2
WORK
-8(2x - 1) = 40
-16x + 8 = 40 [Distributive Property]
-16x + 8 - 8 = 40 - 8
-16x = 32
-16x/(-16) = 32/(-16)
x = -2
Solve for p:
5p = 2p + 8
p = 0.375
Solve:
Two buildings have the same total height. One building has 8 floors with height, h. The other building has a ground floor of 16ft and 6 other floors with height, h. Write and solve an equation to find the height, h, of these floors.
8h = 16 + 6h
h = 8
WORK
8h = 16 + 6h
8h - 6h = 16 + 6h - 6h
2h = 16
2h/2 = 16/2
h = 8
Solve for m:
3(4m+9) = 48
m = 2
WORK
12m+27=51
51-27= 24
24/12=2
m = 2
Solve for x:
(x – 7)3 = 12
x = 11
Solve for y:
4(2y+3)=26
y = 1.75
Solve for x:
2(5x - 1) = 3(x + 11)
x = 5
WORK
2(5x - 1) = 3(x + 11)
10x - 2 = 3x + 33 [Distribute]
10x - 3x - 2 = 3x - 3x + 33
7x - 2 + 2 = 33 + 2
7x/7 = 35/7
x = 5
Solve
Online concert tickets cost $37 each, plus a service charge of $8.50 per ticket. The Web site also charges a transaction fee of $14.99 for the purchase. You paid $242.49. How many tickets did you buy?
You bought 5 tickets.
WORK
37t + 8.50t + 14.99 = 242.49
45.5t + 14.99 = 242.49
45.5t + 14.99 - 14.99 = 242.49 - 14.99
45.5t = 227.5
45.5t/45.5 = 227.5/45.5
t = 5 ~~~> 5 tickets
Solve for p:
7.17 = p + 2.54
p = 4.63
WORK
7.17 = p + 2.54
7.17-2.54 =
p = 4.63
Solve for x:
-24 = -10x + 3
x = 2.7
WORK
-24 = -10x + 3
-24 - 3= -10x + 3 - 3
-27 = -10x
-27/(-10)=-10x/(-10)
2.7 = x
Solve for k:
2k-6/2=7
k = 10
Solve for x:
9m - 4 = -3m + 5 + 12m
NO SOLUTION
-4 = 5
WORK
9m - 4 = -3m + 5 + 12m
9m - 4 = -3m + 12m + 5
9m -9m - 4 = 9m -9m + 5
-4 = 5 <~~~NO! So, No Solution!
Solve
Pristine Printing will print business cards for $0.10 each plus a setup charge of $15. The Printing Place offers business cards for $0.15 each with a setup charge of $10. What number of business cards costs the same from either printer? BONUS: What would the cost be?
Printing 100 cards would cost the same from either business.
WORK
0.10n + 15 = 0.15n + 10
0.10n - 0.10n + 15 = 0.15n - 0.10n +10
15 = 0.05n + 10
15 - 10 = 0.05n + 10 - 10
5 = 0.05n
5/0.05 = 0.05n/0.05
100 = n ~~~>100 cards
BONUS answer: It would cost $25.00 to make 100 cards from either place.
WORK
0.10n + 15 = ??
0.10(100) + 15 = 25 ~~~>$25.00
0.15n + 10 = ??
0.15(100) + 10 = 25 ~~~>$25.00