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vickie19

  • 3 years ago

3x+y=7 for y

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  1. Calcmathlete
    • 3 years ago
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    Basically, you're trying to isolate the y... 3x is being added to y. What do you do to make a positive 3x to make it equal zero? Perform this on both sides of the equation.

  2. vickie19
    • 3 years ago
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    can u write out the steps so i can c how the to solve it

  3. Calcmathlete
    • 3 years ago
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    I can't really give you a full answer, but I can show you an example that is very similar... Solve for y. 5x + y = 2 - 5x + 5x + y = 2 - 5x 0 + y = 2 - 5x y = 2 - 5x Do you get it?

  4. vickie19
    • 3 years ago
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    that was not the right problem. the problem is 3X+y=7 for y

  5. Calcmathlete
    • 3 years ago
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    Yes. I said that it was an EXAMPLE. It is very similar to the actual problem...

  6. vickie19
    • 3 years ago
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    i do not understand what u just did

  7. Calcmathlete
    • 3 years ago
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    Ok. Maybe this will help... Solve for y in the following problem. 5x + y = 2 This is the example problem. - 5x + 5x + y = 2 - 5x Subtract 5x from both sides. 0 + y = 2 - 5x Do you see how 5x - 5x = 0? I just combined like terms. y = 2 - 5x 0 + anything is what was being added to 0.

  8. Calcmathlete
    • 3 years ago
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    So do the same thing in the original problem. 3x + y = 7 This is the problem. 3x - 3x + y = 7 - 3x Subtract 3x from both sides. 0 + y = 7 - 3x Combine like terms. y = ???? Can you do what's above??

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