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3 years ago

Please help ASAP work and answer please please

Mathematics

1 answer:

tiny-mole [99]3 years ago

5 0

Answers:

8. 12x+3= 27

move 3 to the other side , sign changes from +3 to -3

12x+3-3=27-3

12x= 24

divide by 12 for both sides

12x/12=24/12

x= 2

9. 6(y-10)=42

mutiply the bracket by 6

(6)(y)(6)(-10)= 6y-60

6y-60= 42

move -60 to the other side, sign changes from -60 to +60

6y-60+60=42+60

6y=102

divide by 6

6y/6=102/6

y=17

10. 9x-2=4x+13

move +4x to the other side

9x-4x-2= 4x-4x+13

5x-2= 13

5x-2+2= 13+2

5x= 15

divide by 5 for both sides

5x/5= 15/5

x= 3

11. 4/3y+5/2y= 1

find the common denominator for both of the fractions which is 6.

Mutiply by 2 for 4/3y .

4(2)/3(2)y=8/6y

Mutiply by 3 for 5/2y

5(3)/2(3y)= 15/6y

8/6y+15/6y= 23/6y

23/6y= 1

Mutiply both sides by 6/23

23/6y(6/23)= 1 (6/23)

Cross out 6 and 6 , divide by 6 and then becomes 1.

Cross out 23 and 23, divide by 23 and then becomes 1.

1*1*y=y

y= 6/23

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3 years ago

What 2 numbers multiply to be -14 and add to be -3

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$\frac{x^{2}}{x} + \frac{-14}{x} = -3$
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$x = \frac{-3 \± \sqrt{9 + 56}}{2}$
$x = \frac{-3 \± \sqrt{65}}{2}$
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$x = 2.53$ $or$ $x = -5.53$

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2.53 + y = -3
- 2.53 - 2.53
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x + y = -3
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The two numbers that multiply to -14 and add up to -3 are -5.53 and 2.53.

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3 years ago

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second option

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Given the rule

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D(4, - 4 ) → D'(4 + 3, - 4 - 5 ) → D'(7, - 9 )

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