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SephI

  • one year ago

Alright, guys, I'm confused. J + S = 150 2J + 3.5S = 405 Solving for J

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  1. hartnn
    • one year ago
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    you have 2 methods : elimination, substitution. which one u wanna use ?

  2. SephI
    • one year ago
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    I thought, S = 150 - J <-- sub 2J + 3.5(150 - J) = 405 2J + 525 - 3.5J = 405 -1.5J = -120 J = 80, is that right?

  3. hartnn
    • one year ago
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    yes, correct.

  4. hartnn
    • one year ago
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    any doubts

  5. SephI
    • one year ago
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    No doubts.

  6. hartnn
    • one year ago
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    good :)

  7. SephI
    • one year ago
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    @hartnn , got a question. If I had, 2x + y = 3, and I wanted to put in y = mx + b I would say: y = 2x + 3, or would the 2x be negative because I switched it's side?

  8. hartnn
    • one year ago
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    since u switched side its -2x

  9. hartnn
    • one year ago
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    a better way to explain that is 2x+y=3 subtracting 2x from both sides 2x-2x+y= -2x +3 i subtracted because we need to do inverse operation, since 2x was added to y, to isolate y, you subtract it.

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