kayleigh98
  • kayleigh98
Write the equation for the line using the given information. Write the equation in slope-intercept form, y = mx + b. Write the equation of the line with slope = 5 and passing through the point (−4, −7).
Algebra
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SOLVED
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katieb
  • katieb
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LynFran
  • LynFran
you already have all the info to solve this... slope=5 so... m=5 points (x, y) so,.. x = -4 and y=-7 now sub those values into the given slope - intercept formula ... then solve for "b" which is the y intercept
LynFran
  • LynFran
what equation did u get ..?
kayleigh98
  • kayleigh98
So i take those and substitute them into the equation for b?

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LynFran
  • LynFran
yes like this y=mx+b -7=5(-4)+b now solve for "b"
kayleigh98
  • kayleigh98
7/20?
LynFran
  • LynFran
no... first we multiply the parentheses ..we get -7=-20+b then we add 20 to both sides of the equation ...we get -7+20=-20+20+b simplify we get 20-7=b ...whats b=?
kayleigh98
  • kayleigh98
13?
kayleigh98
  • kayleigh98
great i got it thank you!
LynFran
  • LynFran
yes and thats the y intercept now we write the equation using the slope and y intercept y=mx+b ... we just sub the value of "m" and "b"

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