anonymous
  • anonymous
Find the equation of the tangent line to the curve y2+4xy+x2 = 13 at the point (2; 1).
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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bahrom7893
  • bahrom7893
find the first derivative: 2y*y' + 4(x*y' + y) + 2x = 0 2y*y' + 4x*y' + 4y + 2x = 0
bahrom7893
  • bahrom7893
all you have to do now is find y' as it is also the slope of the tangent line. Plug in 2 for x and 1 for y: 2*y' + 4*2*y'+4*1+2*2 = 0 2y'+8y' = -4-4 10y' = -8 y' = M = -8/10
bahrom7893
  • bahrom7893
Now use the formula: y - y1 = M(x-x1) y-1 = (-4/5)(x-2)

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bahrom7893
  • bahrom7893
M = -8/10 = -4/5 thats how i got -4/5 in the previous part..
bahrom7893
  • bahrom7893
Simplify: y-1 = (-4/5)(x-2) y = -4x/5 + 8/5 +1 y = -4x/5 + 13/5
bahrom7893
  • bahrom7893
Please click on become a fan if I helped, I really want to get to the next level!! Thanks =)
anonymous
  • anonymous
yeah that helped a lot! it's been a few years since i did this stuff so i totally forgot about using y' as an intermediate variable, makes sense now tho, thanks and I will fan you :)

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