Question

find the number in pic​

Answer 1

Given,

A - 4B + 2C = 16

2A + 7B - 5C = 83

To Find,

A + B - C

Solution,

We can easily solve this problem using the following steps.

Now,

A - 4B + 2C = 16

A = 16 + 4B - 2C ( Taking - 4B + 2C to the right-hand side) ---- eq. 1

2A + 7B - 5C = 83

Putting the value of A from the first equation in this equation,

2( 16 + 4B - 2C) + 7B - 5C = 83

32 + 8B - 4C + 7B - 5C = 83

32 + 15B - 9C = 83

15B - 9C = 83 - 32

15B - 9C = 51

3(5B - 3C) = 51

5B - 3C = 51/3

5B - 3C = 17 --- eq. 2

We have to find the value of A + B - C

Putting the value of A from equation 1,

16 + 4B - 2C + B - C

16 + 5B - 3C

Putting the value of 5B - 3C from equation 2,

16 + 17 = 33

Hence, the value of A + B - C will be 33.

Answer 2

Answer:

answer is 33 by solving equations