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3 years ago

2x+y=1 and 2x+y=-3 in graphing,Substitution,and elemination

Mathematics

1 answer:

earnstyle [38]3 years ago

5 0

2x+y=1
-2x-y=3

0¥4

y=-2x+1
y=-2x-3

-2x+1=-2x-3

0¥4

The answer to the question is no solution

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HELP WITH THESE QUESTIONS PART 2.

polet [3.4K]

Answer: (a) IV (b) positive (c) $\frac{\pi}{4}$ (d) C (e) $\sqrt{2}$

Step-by-step explanation:

a) $\frac{15\pi}{4}$ - $\frac{8\pi}{4}$ = $\frac{7\pi}{4}$ , which is located in Quadrant IV per the Unit Circle.

b) sec is $\frac{1}{cos}$ . Cos is the x-coordinate. The x-coordinate inQuadrant IV is positive.

c) the reference angle is the angle from $\frac{7\pi}{4}$ to 2π = $\frac{\pi}{4}$

d) since the angle is below the x-axis and the reference angle is $\frac{\pi}{4}$ , then the angle is equal to $-sec(\frac{\pi}{4}$ )

e) sec = $\frac{1}{cos}$ ⇒ sec $\frac{7\pi}{4}$ = $\frac{2}{\sqrt{2} }$ = $\frac{2}{\sqrt{2} }$ $(\frac{\sqrt{2}} {\sqrt{2}})$ = $\frac{2\sqrt{2} }{2}$ = $\sqrt{2}$

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Answer: (a) $\frac{3\pi}{2}$ (b) (0, -1) (c) A (d) -1

Step-by-step explanation:

a) $\frac{11\pi}{2}$ - $\frac{4\pi}{2}$ = $\frac{7\pi}{2}$ - $\frac{11\pi}{2}$ = $\frac{3\pi}{2}$

b) $\frac{3\pi}{2}$ is on the Unit Circle at (0, -1)

c) sin = $\frac{opposite}{hypotenuse}$ which equals $\frac{y}{r}$ on the Unit Circle.

d) sin is the y-coordinate. sin $(\frac{3\pi}{2})$ = -1

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3 years ago

28. The United States Postal Service delivers many packages every day. A postal carrier recorded the number of packages he deliv

Rudiy27

Answer:

(B) 23

Step-by-step explanation:

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3 years ago

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Help me for number 14 I NEED SHOW WORK TOI PLZ!

S_A_V [24]

Ouch! That is hard but I can do it. First, find the area of the triangle. (for both is 60) Then find the area of the rectangle (base) which is 48. Then do the rectangles on the sides which are 72 each (for both is 144) Then add it all together and get 252 ft squared or cubed.

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3 years ago

By which angle must AB turn about point A in the clockwise direction so that it coincides with AE ? A. 90° B. 180° C. 270° D. 36

dmitriy555 [2]

Answer:

B. 180°

Step-by-step explanation:

Rotate AB 180 degrees in the clockwise direction.

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3 years ago

A shopkeeper sold a dressing table for 7512.75 at a profit of 19*1/4% What was the cost price.

Katarina [22]

Cp=7512.75×[100÷(100+77÷4)]
=7512.75×(100÷119.25)
=6300
c.p=6300

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3 years ago