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3 years ago

PLEASE HELP x+4y=6 x+y=3 Solve for x and y

Mathematics

2 answers:

slamgirl [31]3 years ago

7 0

I don't understand the y after the 4... but would it be x=2 y=1 ?

ohaa [14]3 years ago

5 0

X is 2 and y is 1 ;)

You know 4 is really close to six, so even if you put y as two, 4x2 is 8 and you can't add anything to get to six, so you can automatically tell it is 1.
Knowing that, you can easily solve X.
Ask yourself "What do you add to 4 to get 6?) and you get 2.
In the next problem, 1+2 is 3, which proves your answer.

Hope this helped

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4 years ago

Read 2 more answers

A triangle has two constant sides of length 5 feet and 7 feet. The angle between these two sides is increasing at a rate of 0.9

o-na [289]

Answer: $12.74 ft^2/s$

Step-by-step explanation:

Given

Two sides of triangle of sides 5 ft and 7 ft

and angle between them is increasing at a rate of 0.9 radians per second

let $\theta$ is the angle between them thus

Area of triangle when two sides and angle between them is given

$A=\frac{ab\sin C}{2}$

$A=\frac{5\times 7\times \sin \theta }{2}$

Differentiate w.r.t time

$\frac{\mathrm{d} A}{\mathrm{d} t}=\frac{35\cos theta }{2}\times \frac{\mathrm{d} \theta }{\mathrm{d} t}$

at $\theta =\frac{\pi }{5}$

$\frac{\mathrm{d} A}{\mathrm{d} t}=\frac{35\times cos(\frac{\pi }{5})}{2}\times 0.9$

$\frac{\mathrm{d} A}{\mathrm{d} t}=12.74 ft^2/s$

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4 years ago

If m = 22 and n = 3, what is the value of the following expression? m - 5 • n + 3 A. 51 B. 10 C. 4 D. 54

melisa1 [442]

The answer is B, 10.

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