Question

Q.4: Solve the following pair of linear equations by the substitution method.

(i) x + y = 14
x – y = 4

(ii) 3x – y = 3
9x – 3y = 9

Answer 1

Step-by-step explanation:

(1) x+y=14

x-y=4

x=4+y......1

put value of 1 in given pair

4+y+y=14

4+2y=14

2y=10

y=5

x=9

Answer 2

Answer:

1) given, x+y=14......1

x-y=4......2

1= x=14-y

substituting x= 14-y in 2

2= 14-y-y=2

= 14-2y=2

=y=6

1) = x+6=14

=x=8

Therefore x=8, y=6