Veda solves the following system of linear equations by elimination. what is the value of x of the solution?
a –20
b –1
c 1
d 20

To find the value of x, we must arrange first the two equations. We will have:

  4x – 2y = 0     eq. 1

10x + 7y = -3   eq. 2

Eliminate y by multiplying 7/2 to eq. 1

  7/2 {4x – 2y = 0} 7/2

14x – 7y = 0

10x + 7y = -3        ⇒ add eq. 1 to eq. 2

24x = -3

x = -1/8        answer 

we have

-----> equation A

-----> equation B  

Multiply equation A by both sides

------> equation C

Adds equation C and equation B

therefore

the answer is the option B

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

it is not that hard all u have to do is plot the graph

step-by-step explanation: