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Goryan [66]
3 years ago
6

Solve by Elimination b) -4x+2y=-4 4x-5y=-8

Mathematics
1 answer:
ruslelena [56]3 years ago
5 0

Answer:

x = 3

y = 4

Step-by-step explanation:

-4x+2y=-4   -----(eq1)

4x-5y=-8 ------(eq 2)

by elimination,

(eq1) + (eq 2),

(-4x+2y) + (4x-5y) = -4 + (-8)

-4x+2y + 4x-5y = -4 -8

2y-5y = -12

-3y = -12   (divide both sides by -3)

y = -12 / (-3) = 12/3 = 4  (sub back into (eq 1) )

-4x+2y=-4   -----(eq1), when y = 4,

-4x+2(4)=-4  

-4x+8 = -4    (subtract 8 from both sides)

-4x= -4   - 8

-4x= -12 (divide both sides by -4)

x = -12 / (-4) = 3

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Answer:

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Step-by-step explanation:

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined. The range is the set of all valid y values. The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

(-∞,∞)

Set-Builder Notation:

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The range is the set of all valid

y

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Interval Notation:

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Set-Builder Notation:

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3 years ago
What is 8/14 simplified?
Colt1911 [192]

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Step-by-step explanation:


5 0
3 years ago
Read 2 more answers
On paper, use the completing the square method to solve the equation x^2 + 16x + 2. Can anyone help me with this?
scoray [572]

Answer:

x = -8 ± √62

Step-by-step explanation:

An equation needs an equals sign.  I assume the expression equals zero?

x² + 16x + 2 = 0

To complete the square, start by making the leading coefficient 1 (which it already is).

Next, take half of the b coefficient, square it, and add the result to both sides.

(16/2)² = 8² = 64

x² + 16x + 64 + 2 = 64

Factor the perfect square:

(x + 8)² + 2 = 64

Solve for x:

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x = -8 ± √62

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yanalaym [24]

Answer:

5765/574

Step-by-step explanation:

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What's -8.2 x 10 to the fifth power? Please explain your answer. Thank you!
Stolb23 [73]

First lets find -8.2 x 10 = -82 know we find 82^5 which is 82*82*82*82*82

-82*-82=6724 and then 6724*-82= -551368 and then -551368*-82 =45212176 and then 45212176*-82= -3707398432 and finally -3707398432 is our answer i checked the calc to after i did the hard math that took me forever i had some help from the calc and i got this hopefully this helps

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3 years ago
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