math 2

math 2
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  • Ms.Smith can you help me with question 2 on the test.
  • Sure thing, Baljit
  • Incorrect: 15+15y+5y=100+20y+20y
  • Correct: 15+5y=100+20y=20y
  • Your first mistake was with distributing in step 2.The 5 in the brackets is the coefficient of the variable y, so it should be distributed as one.
  • Incorrect: 75y/75=100/75
  • Correct: -20y/-20=100/-20
  • Correct Answer:
  • Your second mistake was with isolating the variable in step 4. Insted of adding you need to subtract.
  • Oh I get it know. Thank you Ms.Smith
  • No Problem, Baljit
  • How could I have made such a dumb mistake 
  • 3(5y)+5y=200x1/2+10(2y)+20y
  • 15y+5y=100+20y+20y
  • -20y/-20=100/-20
  • 20y=100+40y
  • y=-5
  • -20y=100
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