Question

(a) Find the value of a and B for which the following
pair of linear equations has infinite number of
solutions : 2x + 3y = 7;2a x + (a + b) y = 28

Answer 1

Answer:

a=3

b=5

Step-by-step explanation:

2x + 3y = 7;2a x + (a + b) y = 28

2x+3y=7___(1)

2ax+(a+b) y=28___(2)

From(1)

x=7-3y/2

Putting this value in (2)

2a(7-3y/2) +(a+b) y=28

7a-3ay+(a+b) y=28

7a-3ay+ay+by=28

Hence,

a=3

b=5