Question

22x +25y = 21000
25x+22y = 21300
substitute this.​

Answer 1

Step-by-step explanation:

22x +25y = 21000

25x+22y = 21300

When ever you see such type of diagonal

Just add them one time and subtract them one time

Adding them=>

22x +25y = 21000

25x+22y = 21300

___________________

47x +47y = 42300

x+y = 900.........(1)

Subtract them=>

22x +25y = 21000

25x+22y = 21300

- - -

__________________

-3x +3y = -300

x -y = 100.......(2)

add (1)&(2)=>

2x = 1000

x = 500

put x = 500 in (2)

x-y = 100

500-y = 100

y = 400

So,(x,y) = (500,400)

Answer 2

SOLUTION:-

════════════

Given:

• 22x +25y=21000
• 22x +25y=2100025x +22y=21300

To find:

══════

Substitution.

Explanation:

═════════

We have,

•22x+25y= 21000.............(1)

•25x + 22y= 21300...........(2)

Therefore,

From equation (1), we get;

=) 22x +25y= 21000

=) 22x= 21000-25y

$= > x = \frac{21000 - 25y}{22} ..................(3)$

Putting the value of equation (2), we get;

$= > 25( \frac{21000 - 25y}{22} ) + 22y = 21300 \\ \\ = > 525000 - 625y + 484y = 468600 \\ \\ = > 525000 - 141y = 468600 \\ \\ = > - 141y = 468600 - 525000 \\ \\ = > - 141y = - 56400 \\ \\ = > y = \frac{ - 56400}{ - 141} \\ \\ = > y = 400$

Putting the value of y in equation (3),we get;

$x = \frac{21000 - 25(400)}{22} \\ \\ = > x = \frac{21000 - 10000}{22} \\ \\ = > x = \frac{11000}{22} \\ \\ = > x = 500$

Thus,

The value of x is 500 & y is 400.

Follow Me :)