Question

simultaneous equations 5x+3y=9..(I) 2x-3y=12..(II)​

Answer 1

Answer:

5x+3y=9..(I)

2x-3y=12..(II)

Equating the coefficient

10x - 6y = 18

10x - 15y = 60

Difference between both the equation

- 9y = 42

y = - 42/9 = - 14/3

Put y in (1)

5x + 3*(-14/3) =9

5x = 23

x = 23/5

Answer 2

Step-by-step explanation:

5x+3y=9..(I)

2x-3y=12..(II)

Add both equation

5x+3y=9..(I)

2x-3y=12..(II)

----------------

7x=21

x=21/7

(x=3)

Add x=3 in eq .1

5x+3y=9

5×3+3y=9

15+3y=9

3y =9-15

3y=-6

y = -6/3

(y= -2)

(x,y) =(3,-2)