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vichka [17]
2 years ago
11

Solve by substitution

Mathematics
1 answer:
Alekssandra [29.7K]2 years ago
3 0
In second equation add 0.74 and y to both sides: 3.25x+0.74=y;
Substitute y in the first equation: -4.5x-2(3.25x+0.74)=-12.5;
Distribute multiplication over addition:
-4.5x-6.50x -1.48=-12.5;
Combine like terms and add 1.48 to both sides:
-11x= -12.5+1.48;
-11x= 11.02 divide both sides by -11;
X= -11.02/11= -1.00(18)
Y= 3.25• -1.00(18)+.74= -2.515(90)
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Find the value of x<br><br>urgent!! plz help me! will give the brainliest​
Anarel [89]

Answer:

x = 2

Step-by-step explanation:

\frac{1}{2} (x - 1) - \frac{1}{6} (x+1) = 0

In an equation our aim is to find the value of what we are looking for as well as keeping the equation balanced. For example if we divided by 2  only from one side then the equation would change so it's an important rule to keep in mind when solving equations, that you need to keep both sides of the equation the same.

\frac{1}{2} (x - 1) - \frac{1}{6} (x+1) = 0

→ Expand the brackets

\frac{1}{2} x- \frac{1}{2}-\frac{1}{6}x -\frac{1}{6} =0

→ Multiply everything by 12 to make solving the equation easier

6x - 6 - 2x - 2 = 0

→ Simplify equation

4x - 8 = 0

→ Add 8 to both sides to isolate 4x

4x = 8

→ Divide by 4 on both sides to isolate x

x = 2

⇒ We can substitute x = 2 back into the equation to see if the solution is correct, if we get 0 on both sides then x = 2 is correct

\frac{1}{2} (x - 1) - \frac{1}{6} (x+1) = 0

⇒ Substitute in the values

\frac{1}{2} (2-1)-\frac{1}{6} (2+1) = 0

⇒ Simplify

\frac{1}{2} (1)-\frac{1}{6} (3) = 0

⇒ Simplify further

\frac{1}{2} -\frac{1}{2} =0

0 = 0

The solution x = 2 is correct

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3 years ago
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erastova [34]
The answer would be A. -18x^7

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2 years ago
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The average length of an adult eastern coach whip snake is 152.4 centimeters write a sentence comparing its length to the other
crimeas [40]

Answer:

The eastern coach whip snake is:

i. 88.9 cm longer than the Copperhead snake

ii. 88.9 cm longer than the Western cottonmouth snake

iii. 30.8 cm longer than the Timber rattlesnake

iv. 91.4 cm longer than the Queen snake

Step-by-step explanation:

The average length of the adult eastern coach whip snake is 152.4 centimeters.

The length of the Copperhead snake is 63.5 centimeters

The difference between 152.4 and 63.5 is 152.4-63.5=88.9

Therefore the eastern coach whip snake is 88.9 cm longer than the Copperhead snake

The Western cottonmouth is 63.5 cm just the same length as the copperhead snake.

Hence, the eastern coach whip snake is also 88.9 cm longer than the Western cottonmouth snake

The Timber rattlesnake is 121.6 cm long. Since 152.4-121.6=30.8,  the eastern coach whip snake is 30.8 cm longer than the Timber rattlesnake

Also, 154.2-61=91.4

Therefore  the eastern coach whip snake is 91.4 cm longer than the Queen snake.

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