Solve the following simultaneous equation:x+y over2=1 3xy-7y=2
2 answers:
The ansa is y= -2/3 or -2 x= 2 or 4/3
X+y=2 --> x=2-y...(1) y(3x-7)=2 y=2/(3x-7)...(2) Put (1) in (2) ............2 x=2-(-------) ..........3x-7 ............2(3x-7)-2 --> x= -------------- .................3x-7 --> x= (6x-16)/3x-7 x(3x-7)=6x-16 3x^2 -7x = 6x-16 3x^2 -13x+16=0 [Quadratic Equation] This equation leads to x being an imaginary number based on what you gave. However if you meant x+y ----- = 1 & 3x-7y=2 ..2 Then, x+y=2...(1)x7 3x-7y=2...(2)x1 --> 7x + 7y = 14...(3) ......3x - 7y = 2....(4) --> 10x=16 --> x=16/10 --> x=8/5 or 1.6 Put x=8/5 in (1) (8/5)+y=2 ...........8 y=2-(-----) ...........5 ......10-8 y=---------- ........5 y=2/5 Hence, {x,y} = {8/5,2/5}
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Answer:
638
Step-by-step explanation:
1. Isolate the variable 881 = k - (-243)
-243 -243
2. combine like terms 881 - 243 = k
3. answer 638
C^2 = a^2 + b^2 c^2 = 3.4^2 + 2.6^2 c^2 = 11.56 + 6.76 c^2 = 18.32 c = 4.3 answer c = 4.3
Is -1.393 the significance level and if so what’s the degree of freedom?
It depends how many peppers and apples were in the fridge
Answer:
8,000 in the 8% account
20,000 in the 9% account.
Step-by-step explanation:
x + y = 28000
0.08 x + 0.09 y = 2440
0.08 x + 0.09 (28000 − x) = 2440
0.08 x + 2520 − 0.09 x = 2440
80 = 0.01 x
x = 8000
y = 20000