Question

: X+Y=15 , X--Y=3 * solve by substitute method

Answer 1

Answer:

x=9 y=6

Step-by-step explanation:

from 2nd equation, x = y+3

substitute this value in 1st equation.

then, 2y+3=15

y = 12/2 = 6

x = 6+3= 9

Answer 2

Answer:

X+Y=15 , X-Y=3

Let us take the first equation

X+Y=15

X= 15-Y.................(1)

Now let us take the second equation

X-Y=3

Now put  15-Y in place of x according to equation (1)

⇒ (15-Y)-Y=15

⇒ 15 -2Y=15

⇒ -2Y=15-15

⇒ -2Y = O

⇒ Y = 0/-2

⇒ ∴ Y = 0

To find X take equation (1)

⇒ X=15-Y

⇒ X=15-0

⇒ X=15

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