Question

12) Solve: 0.1x - 0.2y = 2 ; x + y = 17 by Substitution method.​

Answer 1

Step-by-step explanation:

0.1x - 0.2y = 2

x + y = 17

= x = 17 - y

Substituting the value of x in the equation,

(17 - y)0.1 - 0.2y = 2

= 1.7 - 0.1y - 0.2y = 2

= - 0.3y = 0.3

= y = -1

Now substitute the value of y in (x + y = 17),

= x + (-1) = 17

= x = 17 + 1 = 18.

Therefore,

x = 18

y = -1