Can somebody prove this mathmatical induction?

See explanation

Step-by-step explanation:

1 step:

n=1, then

So, for j=1 this statement is true

2 step:

Assume that for n=k the following statement is true

3 step:

Check for n=k+1 whether the statement

is true.

Start with the left side:

According to the 2nd step,

Substitute it into the

So, you have proved the initial statement

w

step-by-step explanation:

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9