anonymous
  • anonymous
Check my answer? I needed to make these equations into y = mx + b form: 42x - 4y = 3, 21x = 2y - 3, and 21x = y + 3/2. My answer for #1: y = - 10.5x - (3/4). For #2: y = 10.5x + 1.5, For #3: y = - 21x + 3/2.
Mathematics
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SOLVED
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katieb
  • katieb
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phi
  • phi
you are getting the wrong signs on answers #1 and #3
anonymous
  • anonymous
What do you mean by signs?
phi
  • phi
42x - 4y = 3 can you do this one step by step ?

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More answers

anonymous
  • anonymous
I subtract 42x from both sides and get - 4y = - 42x + 3, then I divide everything by - 4, to isolate y and get y = - 10.5x - (3/4).
phi
  • phi
sounds good, except -42x/-4 is not -10.5x
phi
  • phi
minus over minus makes a positive
anonymous
  • anonymous
It's positive 10.5, just realized my mistake.
phi
  • phi
that's what I meant by getting the wrong sign
anonymous
  • anonymous
Okay, thanks.
phi
  • phi
for the last question 21x = y + 3/2 subtact 3/2 from both sides 21x - 3/2 =y or y = 21x -3/2
anonymous
  • anonymous
Thanks

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