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Zinaida [17]
3 years ago
5

Find an equation of the tangent line to the graph of

Mathematics
2 answers:
lakkis [162]3 years ago
6 0

Answer:

y + 4 = -3 (x - 5)

In other words,

y = -3 x + 11

Step-by-step explanation:

The slope of the tangent line to y = g(x) at x = 5 is the same as the value of g'(x). g'(5) = 3. Therefore, 3 will be the slope of the tangent line.

The tangent line goes through the point of tangency (5, g(5)). g(5) = -4. Therefore, the tangent line passes through the point (5, -4).

Apply the slope-point form of the line. The equation for a line with slope <em>m</em> that goes through point (a, b) will be y - b = m(x - a). For the tangent line in this question,

  • m = 3,
  • a = 5, and
  • b = -4.

What will be the equation of this line?

Darina [25.2K]3 years ago
5 0

Answer:   y = 3x - 19

<u>Step-by-step explanation:</u>

            y = g(x)

                 g(5) = -4  

⇒        y =           -4       <em>when x = 5</em>     ⇒    (5, -4)  


g'(5) = 3     means that when x = 5, the tangent slope (m) = 3

  • <em>because the first derivative gives the tangent slope</em>

Use the Point-Slope formula to find the equation of the line that passes through the point (5, -4) with slope (m) of 3:

y - y₁ = m(x - x₁)

y -(-4) = 3(x - 5)

y + 4 = 3x - 15

y       = 3x - 19

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