Title: Math 7 Solve Addition and Subtraction Equations
Course: quiz duplicate error

Show your steps in solving:  x + 9.3 = 5
Feedback: Show that you subtract 9.3 from both sides, like this: x + 9.3 - 9.3 = 5 - 9.3 x + 0 = -4.3 x = -4.3

Show your steps in solving:  k – $$ \frac{3}{4} $$ = $$ \frac{1}{2} $$

Q: Solve the equation. Check your solution.

s + 6 = 9
- s = -15 (incorrect)
- s = 3 (correct)
- s = 15 (incorrect)
- s = -3 (incorrect)
A: s = 3

Q: Solve the equation. Check your solution.

m - 5 = 8
- m = 13 (correct)
- m = -3 (incorrect)
- m = -13 (incorrect)
- m = 3 (incorrect)
A: m = 13

Q: Solve the equation. Check your solution.

h + 3 = 3\[\frac{1}{3}\]
- h = 1 (incorrect)
- h = 3 (incorrect)
- h = \[\frac{1}{3}\] (Well done!)
- h = \[\frac{19}{3}\] (You need to subtract 3 from both sides, not add it.)
A: h = \[\frac{1}{3}\]

Q: Solve the equation. Check your solution.

x – \[\frac{11}{21}\] = \[-\frac{10}{21}\]
- x =\[\frac{1}{21}\] (correct)
- x = -1 (You need to add +11/21 to both sides of the equation.)
- x = \[-\frac{1}{21}\] (You are adding +11/21 and -10/21. The solution should be positive.)
- x = 1 (You need to add +11/21 to both sides of the equation.)
A: x =\[\frac{1}{21}\]

Q: Solve the equation. Check your solution.

28 = a - 30
- a = -2 (incorrect)
- a = -58 (incorrect)
- a = 58 (correct)
- a = 2 (incorrect)
A: a = 58

Q: Solve the equation. Check your solution.

-1 + z = 15
- z = 16 (correct)
- z = -16 (incorrect)
- z = -14 (incorrect)
- z = 14 (incorrect)
A: z = 16

Q: Solve the equation. Check your solution.

m - 9 = -4
- m = -13 (incorrect)
- m = -5 (incorrect)
- m = 13 (incorrect)
- m = 5 (correct)
A: m = 5

Q: Solve the equation. Check your solution.

20 = -11 + z
- z = -31 (incorrect)
- z = 9 (incorrect)
- z = 31 (correct)
- z = -9 (incorrect)
A: z = 31

Q: Solve the equation. Check your solution.

z - 1.34 = 0
- z = 0.34 (incorrect)
- z = 1.34 (correct)
- z = -1.34 (incorrect)
- z = -0.34 (incorrect)
A: z = 1.34

Q: Solve the equation. Check your solution.

18 = -10 + b
- b = 8 (incorrect)
- b = 28 (correct)
- b = -8 (incorrect)
- b = -28 (incorrect)
A: b = 28

Q: Solve the equation. Check your solution.

25 = s - 2
- s = -27 (incorrect)
- s = 27 (correct)
- s = 23 (incorrect)
- s = -23 (incorrect)
A: s = 27

Q: Solve the equation. Check your solution.

18 = -25 + a
- a = -7 (incorrect)
- a = 43 (correct)
- a = 7 (incorrect)
- a = -43 (incorrect)
A: a = 43

Q: Solve the equation. Check your solution.

t + \[\frac{7}{11}\] = \[\frac{9}{11}\]
- t = \[\frac{8}{11}\] (incorrect)
- t = 2 (incorrect)
- t = \[\frac{16}{11}\] (incorrect)
- t = \[\frac{2}{11}\] (correct)
A: t = \[\frac{2}{11}\]

Q: Solve the equation. Check your solution.

x + 1 [Image] = 1 [Image]
- x = 1 (incorrect)
- x = [Image] (incorrect)
- x = [Image] (correct)
- x = [Image] (incorrect)
A: x = [Image]

Q: Solve the equation. Check your solution.

\[\frac{1}{3}\] + x = 8
- x = \[\frac{25}{3}\] (incorrect)
- x = 23 (incorrect)
- x = \[\frac{23}{3}\] (correct)
- x = \[\frac{7}{3}\] (incorrect)
A: x = \[\frac{23}{3}\]

Q: Solve the equation. Check your solution.

\[\frac{1}{3}\] + x = 7
- x = \[\frac{22}{3}\] (Incorrect. You need to subtract 1/3 from both sides.)
- x = 20 (incorrect)
- x = \[\frac{20}{3}\] (correct)
- x = 2 (incorrect)
A: x = \[\frac{20}{3}\]

Q: Solve the equation. Check your solution.

x – \[\frac{1}{2}\] = \[\frac{4}{5}\]
- x = \[\frac{7}{10}\] (incorrect)
- x = \[\frac{3}{10}\] (incorrect)
- x = 3 (incorrect)
- x = \[\frac{13}{10}\] (correct)
A: x = \[\frac{13}{10}\]

Q: Solve the equation. Check your solution.

9 = a - 28
- a = -37 (incorrect)
- a = 19 (incorrect)
- a = -19 (incorrect)
- a = 37 (correct)
A: a = 37

Show your steps in solving:

-8 = w – 3
Feedback: Add 3 to both sides, like this: -8 + 3 = w – 3 + 3 -5 = w + 0 -5 = w Students can leave out the + 0 step, as long as they show adding 3 to both sides.