Find the value of the expression at x - 2 and y - 1- 45 - -39 - 21 - x - 28 - y - -152 - 85 - - 9

(– 45) – (–39) + (21 × x) – (28 × y) – (–152) – 85 + (– 9) (– 45) – (–39) + (21 × 2) – (28 × 1) – (–152) – 85 + (– 9) = – 45 +39 + 42 – 28 + 152 – ...

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Standard VII

Mathematics

Property of Equality

Find the valu...

Question

Find the value of the expression at $x = 2$ and $y = 1$ :
$(- 45) - (- 39) + (21 \times x) - (28 \times y) - (- 152) - 85 + (- 9)$

- 550

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66

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Solution

The correct option is C $66$
$(- 45) - (- 39) + (21 \times x) - (28 \times y) - (- 152) - 85 + (- 9)$
$(- 45) - (- 39) + (21 \times 2) - (28 \times 1) - (- 152) - 85 + (- 9)$
= $- 45 + 39 + 42 - 28 + 152 - 85 - 9$
= $- 45 - 28 - 85 - 9 + 39 + 42 + 152$
= $- 167 + 233$
= $66$

So, option (d) is correct.

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Q. If

\frac{2}{x} + \frac{3}{y} = \frac{9}{x y} and \frac{4}{x} + \frac{9}{y} = \frac{21}{x y}

, find the values of x and y.

Find the value of the expression:
(–45) – (–39) + 42 – 28 – (–152) – 85 + (–9)

Q. Find the value of the given expression

(- 45) - (- 39) + 42 - 28 - (- 152) - 85 + (- 9)

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Find the value of the expression at x=2 and y=1: (– 45) –(–39)+(21× x) –(28× y) –(–152) –85+(– 9)

The correct option is C 66(– 45) –(–39)+(21× x) –(28× y) –(–152) –85+(– 9) (– 45) –(–39)+(21× 2) –(28× 1) –(–152) –85+(– 9) = – 45 +39+42 –28 +152 – 85 – 9 = – 45 –28–85– 9+39+42 +152 = −167+233 = 66 So, option (d) is correct.

Find the value of the expression at $x = 2$ and $y = 1$ :
$(- 45) - (- 39) + (21 \times x) - (28 \times y) - (- 152) - 85 + (- 9)$