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Standard VIII

Mathematics

Introduction to Algebraic Expressions

If x=1 ; y=...

Question

If $x = 1; y = 2$ , find the value of the following expression.
$4 x - 3 y + 5$

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Solution

The correct option is A $3$
We simply substitute $x = 1, y = 2$ in the given expression $4 x - 3 y + 5$ as shown below:

$4 x - 3 y + 5 = (4 \times 1) - (3 \times 2) + 5 = 4 - 6 + 5 = 9 - 6 = 3$

Hence, the value of the expression $4 x - 3 y + 5 = 3$ when $x = 1, y = 2$ .

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Similar questions

Q. If

x = 1

;

y = 2

find the values of the following expressions :
(i)

4 x - 3 y + 5

(ii)

x^{2} + y^{2}

(iii)

x y + 3 y - 9

Q. If

x = 1; y = 2

find the values of the following expressions.

x y + 3 y - 9

Q. If

3 y + 4 x = 1, y = x + 5

and

5 y + b x = 3

are concurrent, find the value of 'b'.

Q. Find the value of the expression

\frac{10^{- 1} \times 5^{x - 3} \times 4^{x - 1}}{10 \times 5^{x - 5} \times 4^{x - 2}}

Which of the following pairs of linear equations is inconsistent?
$1. x + 3 y - 5 = 0, 2 x + y = 0$
$2. 2 x + y = 1, 2 y = 2 - 4 x$
$3. 2 x - y = 2, 2 y - 4 x = 2$

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If x=1;y=2, find the value of the following expression.4x−3y+5

The correct option is A 3We simply substitute x=1,y=2 in the given expression 4x−3y+5 as shown below:4x−3y+5=(4×1)−(3×2)+5=4−6+5=9−6=3Hence, the value of the expression 4x−3y+5=3 when x=1,y=2.

If $x = 1; y = 2$ , find the value of the following expression.
$4 x - 3 y + 5$

The correct option is A $3$
We simply substitute $x = 1, y = 2$ in the given expression $4 x - 3 y + 5$ as shown below:

$4 x - 3 y + 5 = (4 \times 1) - (3 \times 2) + 5 = 4 - 6 + 5 = 9 - 6 = 3$

Hence, the value of the expression $4 x - 3 y + 5 = 3$ when $x = 1, y = 2$ .