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jonny [76]
3 years ago
14

Select all of the equations that are equivalent to 3 x − 12 = 19

Mathematics
2 answers:
nydimaria [60]3 years ago
7 0

Answer:

X=2

Step-by-step explanation:

x

=

−

2

Explanation:

Collect terms in x on the left side of the equation and numeric values on the right side.

add 3x to both sides.

5

x

+

3

x

+

12

=

−

3

x

+

3

x

−

4

⇒

8

x

+

12

=

−

4

subtract 12 from both sides.

8

x

+

12

−

12

=

−

4

−

12

⇒

8

x

=

−

16

To solve for x, divide both sides by 8

8

x

8

=

−

16

8

⇒

x

=

−

2

As a check

Substitute this value into the equation and if the left side is equal to the right side for this value then it is the solution.

left side  

=

(

5

×

−

2

)

+

12

=

−

10

+

12

=

2

right side  

=

−

(

3

×

−

2

)

−

4

=

=

6

−

4

=

2

⇒

x

=

−

2

is the solution

Jobisdone [24]3 years ago
4 0

Answer:

b Beacuse you can't times 3 by twelve but you can multiple 3times7+1 to get 19

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Step-by-step explanation:

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What is the solution to this system of equations? 4x + 5y = 7
Nutka1998 [239]

Answer:

(-2, 3)

Step-by-step explanation:

4x + 5y = 7

3x - 2y = -12

Let's solve this by elimination. We want to eliminate one variable at a time. This means we need to multiply the equations to create a common multiple to cancel out a variable.

Let's work with y.

5y and -2y: For these values to cancel out, we need to multiply each term to create a common multiple.

2(4x + 5y = 7)

5(3x - 2y = -12)

Multiply.

8x + 10y = 14

15x - 10y = -60

Eliminate.

23x = -46

Divide both sides by 23.

x = -2

Now that we know x, let's plug it back into one of equations to find y.

4x + 5y = 7

4(-2) + 5y = 7

Multiply.

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Add.

5y = 15

Divide.

y = 3

Now we know x and y; let's plug both back into the equation we have not checked yet.

3x - 2y = -12

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Multiply.

-6 - 6 = -12

Subtract.

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Your solution is correct.

(-2, 3)

Hope this helps!

8 0
3 years ago
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Answer:

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Step-by-step explanation:

Given

sinΘ = \frac{1}{\sqrt{2} }, then

Θ = sin^{-1}( \frac{1}{\sqrt{2} } ) = 45° → B

7 0
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The equation that passes through (3,6) and is perpendicular to 3x - 4y = - 2
Ad libitum [116K]

Answer:

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Step-by-step explanation:

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kupik [55]

Answer:

It is 0.873 but rounded to hundredth is 0.87

Step-by-step explanation:

expression: (3.24-3/8+7/9-0.15) divided by 4

Solve:  (3.24+7/9-3/8-0.15) divided by 4

= (3.24+0.78-0.375-0.15) divided by 4

=3.49/4

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