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How can I explain my work?
• When given a problem that is not multiple
choice, be sure to show your work! This way I
can give partial credit if it is available and I can
give better feedback based on where you
might have gone wrong.
Example
• Solve the following equation:
• 3 times a number subtracted from 9 is equal
to 2 times the same number increased by 4.
• First, turn this into an equation:
• 9 – 3x = 2x + 4
• Then subtract variables to the left and
constants to the right
• 9 – 3x = 2x + 4
• -9 -2x -2x -9
• -5x = -5
• Last, divide by the coefficient
• -5x = -5
• /-5 /-5
• X = 1
• If you are asked to explain or justify your work,
just make sure to include what we just did. It’s
also a good idea to plug the number back in to
make sure it is correct.
• 9 – 3x = 2x + 4
•
• 9 – 3(1) = 2 (1) + 4
• 9 -3 = 2 + 4
• 6 = 6
• This is correct!

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Justification of work

  • 1.
  • 2. How can I explain my work? • When given a problem that is not multiple choice, be sure to show your work! This way I can give partial credit if it is available and I can give better feedback based on where you might have gone wrong.
  • 3. Example • Solve the following equation: • 3 times a number subtracted from 9 is equal to 2 times the same number increased by 4.
  • 4. • First, turn this into an equation: • 9 – 3x = 2x + 4 • Then subtract variables to the left and constants to the right • 9 – 3x = 2x + 4 • -9 -2x -2x -9 • -5x = -5
  • 5. • Last, divide by the coefficient • -5x = -5 • /-5 /-5 • X = 1
  • 6. • If you are asked to explain or justify your work, just make sure to include what we just did. It’s also a good idea to plug the number back in to make sure it is correct. • 9 – 3x = 2x + 4 • • 9 – 3(1) = 2 (1) + 4 • 9 -3 = 2 + 4 • 6 = 6 • This is correct!