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3 years ago

Solve by using substitution x=3y-1 x+2y=9

Mathematics

1 answer:

kogti [31]3 years ago

3 0

Answer:

x=3y−1x=3y-1

x+2y=9x+2y=9

Replace all occurrences of xx with 3y−13y-1 in each equation.

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Replace all occurrences of xx in x+2y=9x+2y=9 with 3y−13y-1.

(3y−1)+2y=9(3y-1)+2y=9

x=3y−1x=3y-1

Add 3y3y and 2y2y.

5y−1=95y-1=9

x=3y−1x=3y-1

Solve for yy in the first equation.

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Move all terms not containing yy to the right side of the equation.

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Add 11 to both sides of the equation.

5y=9+15y=9+1

x=3y−1x=3y-1

Add 99 and 11.

5y=105y=10

x=3y−1x=3y-1

Divide each term by 55 and simplify.

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Divide each term in 5y=105y=10 by 55.

5y5=1055y5=105

x=3y−1x=3y-1

Cancel the common factor of 55.

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Cancel the common factor.

5y5=1055y5=105

x=3y−1x=3y-1

Divide yy by 11.

x=5,y=2

Step-by-step explanation:

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The square root of 34 is just sqrt(34), or if you're looking for a rounded decimal answer, about 5.83. The square root of -4/11:
$\sqrt{ \frac{-4}{11} } \\
= \sqrt{ \frac{-1 * 4}{11} } \\
= \frac{2i}{ \sqrt{11} } \\
= \frac{2i\sqrt{11}}{11}$
The square root of 34 is an irrational number. The square root of -4/11 is an imaginary number, or nonreal complex number.

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4 years ago

a man sold two jeans at Rs 800. On one he gains a profit of 10 percent on other he loses 15 percent how he gain or loses in whol

kodGreya [7K]

Answer:

Your answer is

That man buy 2 shirts in Rs 410.25.

He sold 1st shirt at Rs 451.275 where he profited 10%.

He sold 2nd shirt at Rs 348.7 where he lost 10%.

Total sold = 2 shirts = (451.275+348.7)= 800(About)

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