How to get following answers right using equations and calculator (no excel) 23.

Question

How to get following answers right using equations and calculator (no excel)

23.

Suppose that D + E = A, that N/A = 0.23 and that D/A = 0.27 . Solve for N/E. (Round your answer to two decimal places. For example, record 0.8373 as .84).

Answer:

(0.32)

24.

Given that x + 2y = 4 and x - 4y = 1 , solve for x. (Round your answer to one decimal place - that is, record 3.48 as 3.5 - and if your answer is a negative number, place a minus sign before the number iwth no space between the minus sign and the number. That is, record negative 1.38 as -1.4).

Answer:

(0.32)

24.

Given that x + 2y = 4 and x - 4y = 1 , solve for x. (Round your answer to one decimal place - that is, record 3.48 as 3.5 - and if your answer is a negative number, place a minus sign before the number iwth no space between the minus sign and the number. That is, record negative 1.38 as -1.4).

Answer:

Explanation / Answer

23.

D+E=A, N/A=0.23, D/A=.27

Dividing First Equation by A

D/A+E/A=1

.27+E/A=1

E/A=1-.27

E/A=.73

A=E/.73

N/A=.23

PUTTING VALUE OF A IN N/A

N/E/.73=.23

N/E=.23/.73=.3151=.32

24.

X+2Y=4

X-4Y=1

REARRANGING SECOND EQUATION

4Y=X-1

Y=X-1/4

PUTTING Y IN EQUAION 1

X+2(X-1)/4=4

X+(X-1)/2=4

X+X/2-.5=4

(2X+X)/2=4.5

3X=4.5*2

3X=9

X=9/3

X=3.0

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