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3 years ago

What's the solution for 2x 7y=2 x y=-1

1 answer:

5 0

Simplifying

(2x + -7y ) = 0

Multiply
(2x + -7y) * (x + y) 
(2x * (x + y) + -7y * (x + y)) = 0
((x * 2x + y * 2x) + -7y * (x + y)) = 0

Reorder the terms:
((2xy + 2x2) + -7y * (x + y)) = 0
((2xy + 2x2) + -7y * (x + y)) = 0
(2xy + 2x2 + (x * -7y + y * -7y)) = 0
(2xy + 2x2 + (-7xy + -7y2)) = 0

Reorder the terms:
(2xy + -7xy + 2x2 + -7y2) = 0

Combine like terms: 2xy + -7xy = -5xy
(-5xy + 2x2 + -7y2) = 0

Solving -5xy + 2x2 + -7y2 = 0

Solving for variable 'x'.

Factor a trinomial.
(2x + -7y)(x + y) = 0

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A random sample of 38 wheel chair users were asked whether they preferred cushion type A or B, and 28 of them preferred type A w

-BARSIC- [3]

Answer:

The statement that cushion A is twice as popular as cushion B cannot be verified

Step-by-step explanation:

From the question we are told that:

Sample size n=38

Type a size A $X_a=28$

Type a size B $X_b=10$

Generally the probability of choosing cushion A P(a) is mathematically given by

$P(a)=\frac{28}{38}$

$P(a)=0.73$

Generally the equation for A to be twice as popular as B is mathematically given by

$P(b)+2P(b)=3P$

Therefore Hypothesis

$Null H_0: p \leq \frac{2P}{3P} \\Altenative H_A:p>\frac{2P}{3P}$

Generally the equation normal approx of p value is mathematically given by

$z=\frac{x-np_0-0.5}{\sqrt{np_0(1-p_0)} }$

$z=\frac{28-(38*2/3)_0-0.5}{\sqrt{38*2/3*1/3} }$

$z=0.75$

Therefore from distribution table

$Pvalue=1-\theta (0.75)$

$Pvalue=0.227$

Therefore there is no sufficient evidence to disagree with the Null hypothesis $H_0$

Therefore the statement that cushion A is twice as popular as cushion B cannot be verified

7 0

3 years ago

????? HELP PLEASEEE!!

lys-0071 [83]

What is the question?

5 0

3 years ago

Factor the expression C^2 - 2c - 63

vagabundo [1.1K]

Answer:

(c + 7) ( c - 9)

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

No explanation needed just the answer please

Otrada [13]

Answer:

Step-by-step explanation:

65x- 12 = 43x + 10

65x - 43x = 10 + 12

22x = 22

x = 22/22

x = 1 

(65x- 12) =

65 * 1 - 12 = 53

43x + 10

43 * 1 -12 = 53

5 0

3 years ago

Can anyone help me on this question please.

STatiana [176]

The answer is 72.
You can figure this out using the Pythagorean theorem: C (78) squared - A (30) squared = B squared though since you already know the longest side.
78 x 78 = 6084
30 x 30 = 900
6084-900= 5184
The square root of 5184 is 72.

5 0

3 years ago