Which system of equations has a solution of approximately (0.7, –1.4)?

Step-by-step explanation:

Given question is incomplete; here is the complete question,

"Which system of equations has a solution of approximately (0.7, -1.4)?"

A). x - y = 2 and x + 2y = -2

B). x - 2y = -2 and x + y = 2

C). x - y = 2 and x - 2y = -2

D). x + y = 2 and x + 2y = -2

"If the given point (0.7, -1.4) is the solution of the system of equations, it will satisfy both the equations"

To check whether the statement given above is true or false we will substitute the values of x and y in the given equations,

A). x - y = 2

   0.7 - (-1.4) = 2.1

                    ≈ 2

    x + 2y = -2

   0.7 + 2(-1.4) = -2.1

                       ≈ -2

   True.

B). x - 2y = -2

     0.7 - 2(-1.4) = 3.5

    x + y = 2

    0.7 - 1.4 = -0.7

    False.

C). x - y = 2

    0.7 - (-1.4) = 2.1 ≈ 2

    x - 2y = -2

    0.7 - 2(-1.4) = 3.5

    False.

D). x + y = 2

    0.7 - 1.4 = -0.7

    x + 2y = -2

    0.7 + 2(1.4) = 3.5

    False.

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

step-by-step explanation:

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b). 4320 have a nice day