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3 years ago

7

How do you solve for x? -12+7=-5(x+2)

2 answers:

dusya [7]3 years ago

7 0

-5= -5x-10

Plus 10 from both sides

5=-5x
X = -1

nordsb [41]3 years ago

7 0

To solve this you would have to use a reverse PEMDAS- it would be easy to start out simplifying the equation so -12 + 7 would be -5. (-5 = -5 (x+2))Next you can try to get rid of the -5 outside the parentheses by adding 5 to both sides, now making the problem 0 = x + 2. So, subtract the two from both sides and you are left with your answer -2= x

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Read 2 more answers

Two fractions have denominators 4 and 6. Their sum is 19/12

Viefleur [7K]

The value of numerators are 3 and 5

<em><u>Solution:</u></em>

Let the numerators of two fractions be x and y

Two fractions have denominators 4 and 6. Their sum is 19/12

Therefore,

$\frac{x}{4} + \frac{y}{6} = \frac{19}{12}$

Cross multiply L.H.S to get simplified

$\frac{6x+4y}{24} = \frac{19}{12}\\\\6x + 4y = 38 ------- eqn 1$

If the numerators are switched their sum is 7/4

Therefore,

$\frac{y}{4} + \frac{x}{6} = \frac{7}{4}$

On simplification, we get

$\frac{6y + 4x}{24} = \frac{7}{4}\\\\4x + 6y = 42 -------- eqn 2$

<em><u>Solve eqn 1 and eqn 2</u></em>

<em><u>Multiply eqn 1 by 4</u></em>

24x + 16y = 152 --------- eqn 3

Multiply eqn 2 by 6

24x + 36y = 252 ---------- eqn 4

<em><u>Subtract eqn 3 from eqn 4</u></em>

24x + 36y = 252

24x + 16y = 152

( - ) -------------------

20y = 100

<h3>y = 5</h3>

<em><u>Substitute y = 5 in eqn 1</u></em>

6x + 4(5) = 38

6x = 38 - 20

6x = 18

<h3>x = 3</h3>

Thus the value of numerators are 3 and 5

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3 years ago

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Delicious77 [7]

Answer:

The first option

Step-by-step explanation:

6 0

3 years ago