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Solving Equations with Variables on Both Sides

If x=1 ; y=...

Question

If $x = 1; y = 2$ find the values of the following expressions.
$x y + 3 y - 9$

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Solution

$= x y + 3 y - 9$
$= (1) (2) + 3 (2) - 9$
$= - 1$

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Similar questions

x = 1

y = 2

find the values of the following expressions :
(i)

4 x - 3 y + 5

x^{2} + y^{2}

x y + 3 y - 9

x = 1; y = 2

, find the value of the following expression.

4 x - 3 y + 5

2 x \div 3 y = 8

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then find the value of

4 x^{2} + 9 y^{2}

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; find the value of the following expression

x^{2} + y^{2} + z^{2} - x y - y z - z x

4 x^{2} + 9 y^{2} = 40, x y = 2

2 x + 3 y

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Solving Equations with Variables on Both Sides

Standard VIII Mathematics

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