ErinWeeks
  • ErinWeeks
What is the y−coordinate of the y−intercept of the line that passes through the points (−4, −4) and (4, 8)? The only question im stuck on PLEASE HELP! :)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
precal
  • precal
figure out the slope then use y=mx+b and sub the slope for m and use one of the points for (x,y) to solve for b. b is our answer
ErinWeeks
  • ErinWeeks
Is there anyway you could start the equation of for me?
precal
  • precal
|dw:1358369271960:dw|tell me what the slope is first

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ErinWeeks
  • ErinWeeks
the slope would be M right but where am I looking for the slope for with the fraction?
precal
  • precal
you need the slope to be able to use it in y=mx+b then you can use one of the points I would use (4,8) x=4 y=8 then you are solving for b. b is known as your y intercept and that is what you are looking for
ErinWeeks
  • ErinWeeks
So I have so far y= ? + 8 Would I plug in the 4?
precal
  • precal
|dw:1358370299889:dw|you need the slope to sub the m value and solve for b
ErinWeeks
  • ErinWeeks
Alright so what operation would I do from here?
anonymous
  • anonymous
next, u can just substitute the M = gradient = slope into this equations to find value b
anonymous
  • anonymous
then, rewrite the equation form in y = mx + b
ErinWeeks
  • ErinWeeks
Whats the value for m?
ErinWeeks
  • ErinWeeks
im so confused on what to do I might just guess lbvs...
anonymous
  • anonymous
m = 3/2
anonymous
  • anonymous
y = mx + b 8 = (3/2)(4) + b 8 = 6 + b b = 8 -6 = 2 then, rewrite the equation: y = mx + b y = 3/2 x + 2 That the final answer
ErinWeeks
  • ErinWeeks
Oh you times by 4 DURR! Thank you so much I really appreciate it that makes so much more sense! Thank you again :)
ErinWeeks
  • ErinWeeks
so y=3/2x+2 is my answer?
anonymous
  • anonymous
yup :)
anonymous
  • anonymous
welcome^^

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