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Solving Equations with Variable on Both Sides

If x = 9 and ...

Question

If x = 9 and y = 2, find the value of 4x - 5y.

A

-26

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B

30

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C

-30

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D

26

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Solution

The correct option is D 26

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Similar questions

Q. Using substitution method find the value of x and y:

3 x + 5 y

= 1

4 x + 5 y

= 2

9 x^{2} + 25 y^{2} = 181

x y = - 6

, find the value of

3 x + 5 y

9^{x + 2} = 720 + 9^{x}

, find the value of

(4 x)^{1 / x}

.

Q. If the straight lines

3 x - 5 y = 7

4 x + a y + 9 = 0

are perpendicular to one another, find the value of a.

2 x + y = 23

4 x - y = 19

, find the values of

5 y - 2 x

\frac{y}{x} - 2

.

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