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Harman [31]
3 years ago
7

X=y-8 and -x-y=0 solve by substitution

Mathematics
1 answer:
soldi70 [24.7K]3 years ago
7 0

Answer:

y=4

Step-by-step explanation:

x=y-8

-x-y=0

-(y-8)-y=0

Distribute the negative

-y+8-y=0

Combine the like terms

-2y+8=0

-8 (to both sides)

-2y=-8

Divide by -2

y=4

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5. What is M<br> (3x - 24)<br> (42+11)
Lelechka [254]

Answer:

(3x - 24)

(42+11)

Step-by-step explanation:

(3x - 24)

(42+11)

4 0
2 years ago
A train travels 1/5 of the distance between two sides in 3/4 hours at this rate how many hours will take the train to travel the
AleksAgata [21]

Answer:3 3/4 hour

If 1/5 takes 3/4 hours, then to travel the whole distance, which is one, it will take 3/4 * 5 hours because 1/5 * 5 =  1

6 0
3 years ago
Which shows the best estimate to use<br> to find 43 × 78?
Over [174]

Answer:

The best estimate for 43x78 is 40x80

Step-by-step explanation:

43 rounded to the nearest ten is 40.

78 rounded to the nearest ten is 80.  

The answer to 40x80 is 3200

4 0
3 years ago
Which solution method would be most efficient to solve the equation (x+3)^2-4=0?
Angelina_Jolie [31]

A-Taking The Square Root

B-Factoring

C-Quadratic Formula

6 0
2 years ago
Help please. only answer if you know :(
Harrizon [31]

Answer:

<em>x = 437.3 ft</em>

Step-by-step explanation:

<u>Right Triangles</u>

In right triangles, where one of its internal angles measures 90°, the trigonometric ratios are satisfied.

We have completed the figure below with the missing internal angle A that measures A = 90° - 29° = 61° because the lines marked with an arrow are parallel.

Given the internal angle A, we can relate the unknown side of length x with the known side length of 500 ft, the hypotenuse of the triangle. We use the sine ratio:

\displaystyle \sin 61^\circ=\frac{\text{opposite leg}}{\text{hypotenuse}}

\displaystyle \sin 61^\circ=\frac{x}{500}

Solving for x:

x = 500 \sin 61^\circ

Calculating:

x = 437.3 ft

7 0
2 years ago
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