Question

If 7x- 5=16 then the value of (3x-4) is​

Answer 1

Answer:

Step-by-step explanation:

Given that,

7x - 5 = 16

7x = 16 + 5 (∵ transposing )

7x = 21

x = 21 / 7 (∵ transposing )

x = 3

∴ ( 3x - 4 ) = ( 3 × 3 - 4 ) = 9 - 4 = 5 is the answer.

Answer 2

7x-5=16 (Given)

7x=16+5 (5 shifted to right hand side)

7x=21 (as 16+5=21)

x=21/7 (7 shifted to right hand side)

x=3 (as 21/7=3)

Putting value of x in given equation,

3x-4

(3×3)-4 (puting the value of x)

9-4=5