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3 years ago

74 points plsss help meee!!!!!

Mathematics

2 answers:

EastWind [94]3 years ago

8 0

Answer:

(b) x- intercept is -1/3; y-intercept is -3/2

Step-by-step explanation:

Given function:

-9x - 2y = 3

x- intercept is:

y = 0 ⇒ -9x = 3 ⇒ x = -1/3

y-intercept is:

x = 0 ⇒ -2y = 3 ⇒ y = -3/2

Correct answer choice is (b)

Anton [14]3 years ago

5 0

Answer:

B) X intercept = (-1/3,0) and Y Intercept = (0,-3/2)

Step-by-step explanation:

To find the x-intercept, substitute in 0 for y and solve for x .

To find the y-intercept, substitute in 0 for x and solve for y .

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3 years ago

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3 years ago

A 10-foot ladder is leaning against a vertical wall. If the bottom of the ladder is being pulled away from the wall at the rate

Alex777 [14]

Answer:

The area is changing at 15.75 square feet per second.

Step-by-step explanation:

The triangle between the wall, the ground, and the ladder has the following dimensions:

H: is the length of the ladder (hypotenuse) = 10 ft

B: is the distance between the wall and the ladder (base) = 6 ft

L: the length of the wall (height of the triangle) =?

dB/dt = is the variation of the base of the triangle = 9 ft/s

First, we need to find the other side of the triangle:

$H^{2} = B^{2} + L^{2}$

$L = \sqrt{H^{2} - B^{2}} = \sqrt{(10)^{2} - B^{2}} = \sqrt{100 - B^{2}}$

Now, the area (A) of the triangle is:

$A = \frac{BL}{2}$

Hence, the rate of change of the area is given by:

$\frac{dA}{dt} = \frac{1}{2}[L*\frac{dB}{dt} + B\frac{dL}{dt}]$

$\frac{dA}{dt} = \frac{1}{2}[\sqrt{100 - B^{2}}*\frac{dB}{dt} + B\frac{d(\sqrt{100 - B^{2}})}{dt}]$

$\frac{dA}{dt} = \frac{1}{2}[\sqrt{100 - B^{2}}*\frac{dB}{dt} - \frac{B^{2}}{(\sqrt{100 - B^{2}})}*\frac{dB}{dt}]$

$\frac{dA}{dt} = \frac{1}{2}[\sqrt{100 - 6^{2}}*9 - \frac{6^{2}}{\sqrt{100 - 6^{2}}}*9]$

$\frac{dA}{dt} = 15.75 ft^{2}/s$

Therefore, the area is changing at 15.75 square feet per second.

I hope it helps you!

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3 years ago