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Methods of Solving an Equation

If 7x + 4 = 2...

Question

Question 6

If 7x + 4 = 25, then x is equal to

(a) $\frac{29}{7}$

(b) $\frac{100}{7}$

(c) 2

(d) 3

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Solution

Given equation is 7x + 4 = 25
$\Rightarrow 7 x = 25 - 4 \Rightarrow 7 x = 21$
On dividing the above equation by 7, we get
x = 3
Hence, the solution of the given equation is 3.

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Q. |− |− 7| − 3| is equal to

(a) − 7 (b) 7 (c) 10 (d) − 10

Question 12

$(- 11) \times 7$ is not equal to

(a) $11 \times (- 7)$
(b) $- (11 \times 7)$
(c) $(- 11) \times (- 7)$
(d) $7 \times (- 11)$

Solve the following question to find the value of 'x':
$7 x + 4 = 25 + 4 x$

If $x + x = 12$ , then value of x should be equal to

Q. Question 12
If

4 t a n θ = 3

(\frac{4 s i n θ - c o s θ}{4 s i n θ + c o s θ})

is equal to

(A)

\frac{2}{3}

\frac{1}{3}

\frac{1}{2}

\frac{3}{4}

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Methods of Solving an Equation

Standard VII Mathematics

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