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tamaranim1 [39]
3 years ago
5

Solve the simultaneous equation using substitution method x-y=8 and 4x+y=4​

Mathematics
1 answer:
aleksklad [387]3 years ago
7 0

x - y = 8

Add y to both sides

x = 8 + y

4x + y = 4

Substitute the value of x from the first equation in

4(8 + y) + y = 4

Simplify and solve

32 + 4y + y = 4

32 + 5y = 4

5y = -28

y = -5.6

Now put that value of y into the first equation

x = 8 + (-5.6)

x = 2.4

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iVinArrow [24]

Answer: y = 5/2x + 6

Step-by-step explanation:

y - y₁ = m(x - x₁)

y - (-9) = 5/2(x- (-6))

y + 9 = 5/2(x+ 6)

y +9 = 5/2x + 15

y = 5/2x + 15 - 9

y = 5/2x +6

6 0
3 years ago
In an experiment you are to flip a two sided coin 100 times and record 55 heads up and 45 tails up. Determine the theoretical an
Orlov [11]

Answer: The answer is C.

Step-by-step explanation:

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7 0
3 years ago
Read 2 more answers
Stella divides 12/8 on her calculator and gets 1.5. Assuming that Stella has not adjusted the calculator's settings, what do the
Romashka [77]

Stella divided 12/8.

If we divide 12 by 8, we get exactly 1.5.

Let us check given options one by one .

A) Stella made an error : Stella didn't made an error because it's just division of two numbers.

B) The answer is exactly 1.5.  : On dividing 12 by 8, we get exactly 1.5, so this option is correct.

C) The calculator rounded the answer. : On dividing 12 by 8, we get exactly 1.5. So, no rounding is required.

D) The calculator truncated the answer. : On dividing 12 by 8, we get exactly 1.5. So, no truncation in the answer.

Therefore, correct option is B) The answer is exactly 1.5.

6 0
3 years ago
Solve for y in terms of x<br> 3(x – 7) + 7y = 10x
MAXImum [283]

Answer:

solve for y is y = x + 3

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Step-by-step explanation:

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3 years ago
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ipn [44]

First, you need to distribute the right side of the equation : 8n - 2

Now the equation is : 20 - 7n = 8n - 2

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Add 7n to both sides : 22 = 15n

Divide both sides by 15 : ( I had to round this one) 1.5 = n

4 0
3 years ago
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