Question

Find the value of x and y
1.x + y = 7 ; x-y=2.​

Answer 1

Given:-

๛x+y=7-(1)

๛x-y=2-(2)

$\rule{200}{1}$

To Find:-

✪The Value of x&y?

$\rule{200}{1}$

AnsWer:-

☞y=$\frac{5}{2}$

☞x=$\frac{4}{5}$

$\rule{200}{1}$

★Subtract Eq-(1)&(2)★

↝x+y=7

↝x-y=2

♦Signs Changed♦

↝2y=5

☞y=$\frac{5}{2}$-(3)

✪Use (3) in (2)✪

↝x-$\frac{5}{2}$=2

↝x=2×$\frac{2}{5}$

☞x=$\frac{4}{5}$

$\rule{200}{2}$

Answer 2

l l Question l l

Find the value of x and y

x + y = 7 ; x - y = 2

l l Answer l l

x + y = 7 => x = 7 - y .........( 1 )

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

in equation ( 1 ) ,putting the value of y,we get

x = 7 - y

=> x = 7 - ( x - 2 )

=> x = 7 - x + 2

=> x + x = 9

=> 2x = 9

=> x = 9/2

in equation ( 2 ) ,putting the value of x ,we get

y = x - 2

=> y = 9/2 - 2

=> y = 9 - 4/2

=> y = 5/2