Question

x - y = 5
x + y = 7. Solve it by substitution method​

Answer 1

Answer:

$x - y = 5(1)$

$x + y = 7(2)$

$(x - y) + (x + y) = 5 + 7$

$2x = 12$

$x = \frac{12}{2}$

$x = 6$

$taking \: x = 6 \: in \: eqution \:( 1)$

$x - y = 5$

$6 - y = 5$

$- y = 5 - 6$

$- y = - 1$

$y = 1$

(x,y)=(6,1) is the solution of equation

Answer 2

Step-by-step explanation:

x-y=5------(i)

x+y=7------(ii)

From(i)

=> x-y=5

=> x=5+y-------(iii)

putting x=5+y in equation (i)

=> x-y=5

=> 5+y-y=5

=> y-y=5-5

.

. .y=0

putting y=0 in equation (iii)

=> x=5+y

=> x=5+0

.

. .x=5