Equations Test

Equations Test

Review answers, for studying for your test tomorrow:

“Solving Equations: Scimatics 8 Assignment”

1.
a) x = 16
b) x = -4
c) y = -3
d) x = 15
e) z = 1
f) y = 7
g) x = 5
h) x = 3
2.
[x][x] [+][+][+][+][+] = [-][-][-]
[x][x] [+][+][+][+][+][-][-][-][-][-] = [-][-][-][-][-][-][-][-]
[x][x] = [-][-][-][-][-][-][-][-]
[x] = [-][-][-][-]
3.
line 2: whatever you do to one side you have to do the SAME thing to the other side
4. first way:
3(x – 2) = 9
3x – 6 = 9
3x – 6 + 6 = 9 + 6
3x = 15
x = 5
second way:
3(x – 2) = 9
x – 2 = 3
x – 2 + 2 = 3 + 2
x = 5

“10 Practice Test”

  1. D
  2. D
  3. A
  4. C
  5. D
  6. Multiplication
  7. -18
  8. a. [-x][-x][-x] [-][-][-][-] = [+][+], b. x = -2
  9. a. -2x + 8 = -6 b. add 8 negative tiles to each side
  10. a. x = 12, b. t = 40, c. k = 37/2, d. d = 147, e. n = -20, f. x = 5
  11. a. distributive property, add 9, divide by -3, b. no distributive property
  12. a. elevation of Athabasca = A, 1536 = 45 + 7A, b. 213m
  13. 90 = 5(L + 3), L = 15
  14. a. didn’t do same thing to both sides, b. do the same thing to both sides
  15. a. 14 = 2(L + 3), L = 4, b. 12 = 2(4 + W), W = 2m, A = 2 x 4 = 8

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