Question

2. Solve the following equations by trial-and
-error method.
a) 4x - 7=9 ​

Answer 1

Answer:

Value of x = 4 satisfied the equation.

Step-by-step explanation:

a) 4x - 7 = 9

Let x = 1

4 × 1 - 7

= 4 - 7

= - 3

∴ x = -3 ≠ 9

x = 2

4 × 2 - 7

= 8 - 7

= 1

∴ x = 1 ≠ 9

x = 3

4 × 3 - 7

= 12 - 7

= 5

∴ x = 5 ≠ 9

x = 4

4 × 4 - 7

= 16 - 7

= 9

∴ x = 9 = 9

Answer 2

Answer:

4x-7=9

4x=9+7

4x=16

x=16/4

x=4 Answer

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