2 years ago

7x + y = 13 4x – 4y = -20

Mathematics

2 answers:

aalyn [17]2 years ago

5 0

Answer: (x,y) = (1,6)

Step-by-step explanation:

xxMikexx [17]2 years ago

3 0

Solve by using substitution method: answer: (X , Y) = (1 , 6)

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lisov135 [29]

Answer:

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2 years ago

The arc of the parabola y = x^2 from (3,9) to (4,16) is rotated about the y-axis. Find the area of the resulting surface. Please

Hitman42 [59]

Answer:

156.5

Step-by-step explanation:

Thinking process:

The area can be calculated using the formula:

$S = \int\limits^4_3 {2\pi x\sqrt{1+}(2x)^{2} } \, dx$

We let the substitution take place.

Therefore, we let $u = 1 + 4x^{2}$

Thus, $du = 8dx.$

So,

$xdx = \frac{1}{8}du$

Also, the interval of the integration changes to [ 37, 65]

Thus,

$S = \int\limits^4_3 {2\pi \sqrt{1+4x^{2} } } \, dx \\= \int\limits^65_35 {2\pi \sqrt{\frac{1}{8}u } } \, dx$

= $\frac{1}{6} [ 65^{\frac{3}{2}-37^{\frac{3}{2} } }$

= 156.5 units²

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2 years ago

What is the simplified form of the expression 0.3 (4x - 4y)?

Agata [3.3K]

Answer:

1.2x-1.2y

Step-by-step explanation:

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Solve these simultaneous equations 2x+3y=13 4x-y=-2

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X = 1/2 y = 4 by elimination

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