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anonymous

  • one year ago

Select the equation in which the graph of the line has a negative slope, and the y-intercept equals -5. 10x + 5y = –25 5x – 10y = –12 20x + 5y = 50 2x + 6y = 10 Select the equation that contains the point (3, -9), and in which the graph of the line has a positive slope. y – 9 = –4(x + 3) y + 9 = 4(x – 3) y – 9 = 4(x + 3) y + 9 = –4(x - 3) http://prntscr.com/8k86m8

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  1. anonymous
    • one year ago
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    @DanJS

  2. DanJS
    • one year ago
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    you can put each answer into the y = m*x + b form and check

  3. Rushwr
    • one year ago
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    for the 1st one is it the 1st answer ? @DanJS

  4. DanJS
    • one year ago
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    or graph by plotting the x and y intercepts and check which has a negative slope, and y=-5 when x=0

  5. DanJS
    • one year ago
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    solve it for y 10x + 5y = -25 5y = -10x -25 y = -2x - 5

  6. DanJS
    • one year ago
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    y=mx+b form, m is the slope and b is the y intercept value

  7. anonymous
    • one year ago
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    so the first answrr would be B?

  8. anonymous
    • one year ago
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    my mistake A?

  9. DanJS
    • one year ago
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    yes

  10. Rushwr
    • one year ago
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    cool

  11. DanJS
    • one year ago
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    the second recall thee slope - point form , you can read a point on the line directly from the equation...

  12. DanJS
    • one year ago
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    y - y1 = m*(x - x1) the point (x1, y1) is on the line, and the slope is m

  13. DanJS
    • one year ago
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    they want positive m value, so +4 , and (x1 , y1) = (3, -9)

  14. anonymous
    • one year ago
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    so would the answer be C?

  15. DanJS
    • one year ago
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    y - (-9) = m*(x - 3)

  16. DanJS
    • one year ago
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    watch the signs

  17. anonymous
    • one year ago
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    True, so it would be B

  18. Rushwr
    • one year ago
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    yeah noh !!!!

  19. Rushwr
    • one year ago
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    what do u think about the last question ?

  20. anonymous
    • one year ago
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    i was thinking A

  21. Rushwr
    • one year ago
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    yeah that's correct

  22. anonymous
    • one year ago
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    k thanks

  23. Rushwr
    • one year ago
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    no problem :)

  24. DanJS
    • one year ago
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    same as the first question, inspect after solving for y=mx+b form

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