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ki77a [65]
3 years ago
15

Solve the system of equations by subtraction. What is the solution for x? 2x+y=1 4z+2y=-1

Mathematics
1 answer:
Stolb23 [73]3 years ago
8 0

\left\{\begin{array}{ccc}2x+y=1&|\text{subtract 2x from both sides}\\4x+2y=-1\end{array}\right\\\\\left\{\begin{array}{ccc}y=-2x+1&(*)\\4x+2y=-1&(**)\end{array}\right\\\\\text{substitute}\ (*)\ \text{to}\ (**):\\\\4x+2(-2x+1)=-1\qquad\text{use distributive property}\\\\4x+(2)(-2x)+(2)(1)=-1\\\\4x-4x+2=-1\\\\2=-1\qquad\text{FALSE}\\\\Answer:\ \boxed{NO\ SOLUTION}

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A: x/8=3/4<br> B: 2/5=x/40<br> C: 1/8=x/40<br> D:x/10=12/15
Aloiza [94]
I’m assuming you want to figure out what x is in the equation so....

6/8=3/4
2/5=16/40
1/8=5/40
8/10=12/15

I hope this helps.
4 0
3 years ago
It is believed that the percentage of people who support candidate A is 56%. A sample of size 100 indicated that 40 people suppo
kondor19780726 [428]

Given data:

Sample size =100

Sample proportion of people support candidate A:

p=\frac{40}{100}=0.40

Population proportion of people support Candidate A :

P=\frac{56}{100}=0.56

Check the condition: nP>10 and n(1-P)>10.

nP=100*0.40=40>10

n(1-P)=100*0.60=60>10

Null Hyposthesis: H_0: P=0.56

Alternative Hypothesis: H_\alpha :P\neq 0.40

The test statistics:

z=\frac{p-P}{\sqrt{\frac{P(1-P)}{n}}}

Plug in p=0.56, P=0.40 and n=100 in the above formula,

z=\frac{0.56-0.40}{\sqrt{\frac{0.40(1-0.40)}{100}}}

z=\frac{0.56-0.40}{\sqrt{\frac{0.40(1-0.40)}{100}}}=3.2659

The table value of z at 10% of significance level is 1.28

Table value is less than the calculated value.

Hence H_0 is rejected at 10% level.

Therefore there is the evidence at an alpha level of 10% to conclude that the percentage of people who support candidate A has changed.

5 0
3 years ago
What is the standard deviation of the data set given below? 4, 7, 8, 9, 12
astraxan [27]

Answer:

sqrt 8.5

Step-by-step explanation:

apex

4 0
3 years ago
Read 2 more answers
(06.01 LC) The value of 3^3 + 4^2 = ___. (5 points) Answer
mixas84 [53]

━━━━━━━☆☆━━━━━━━

▹ Answer

43

▹ Step-by-Step Explanation

3³ + 4²

= 27 + 16

= 43

Hope this helps!

CloutAnswers ❁

Brainliest is greatly appreciated!

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5 0
3 years ago
#1 someone help me with this question pls ??
quester [9]

Answer:

58-51

why to have the speed of a cucumber you need a potato on a skateboard at 1000kmh, ok?

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