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anonymous

  • one year ago

write an equation in the form y= mx+b for the line that has a slope of -5 and contains the point (7,0)

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  1. pooja195
    • one year ago
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    \[\huge~y-y_1=m(x-x_1)\] m=slope (x1,y1)

  2. Rhystic
    • one year ago
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    So you have m in the equation which is the slope. thus you have y = -5x+ b now you need to solve for b. to do this take the y coordinate (0) and plug in to the equation and plug the x coordinate into the equation yielding -> 0 = -5(7) + b <- now solve for b. then you now can put it back into the form of y = mx + b

  3. anonymous
    • one year ago
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    so i multiply -5 from 7 will equal -35

  4. Rhystic
    • one year ago
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    right. now solve for b .

  5. anonymous
    • one year ago
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    how do i solve for b

  6. Rhystic
    • one year ago
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    so you found -35 right which is m*x in the equation y = mx + b you already have 0 for y meaning 0 = -35 + b you now need to isolate b which means b = what?

  7. anonymous
    • one year ago
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    b=-35

  8. Rhystic
    • one year ago
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    not quite.

  9. Rhystic
    • one year ago
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    |dw:1434129642648:dw| does that make sense?

  10. anonymous
    • one year ago
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    ok so take out the negative

  11. Rhystic
    • one year ago
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    yes because you need to move the -35 to the other side. Now you have m and you have b so you plug backinto the formula to create the equation. y = mx +b -> y = -5x + 35

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