Question

If 9a + 4b = 30 and 5a - 4b = - 2. Then a and b are.​

Answer 1

Answer:

a=2

b=3

Step-by-step explanation:

solution

9a + 4b = 30

+ 5a - 4b = -2

+ + +

14a =28 [ -4b and 4b are cancelled out]

or,a=28/14

•°•a=2

Putting the value of a in first equation,

9a+4b=30

or,4b=30-9*2

or,4b=12

or,b=12/4

•°•b=3

•°•a=2

•°•b=3