Question

Prove : 3x - 5y - 4 = 0
9x = 2y + 7

Answer 1

Answer:

x = 9/13

y = -5/13

Step-by-step explanation:

3x - 5y = 4  eq (1).

9x - 2y = 7  eq(2).

3( 3x - 5y = 4)

9x - 15y = 12  eq (3).

Subtracting (1) from (3).

 9x - 15y = 12

- 9x - 2y = 7

∴ -13 y = 5

y = -5/13

Substituting value of y in eq(2)

9x - 2(-5/13) = 7

9x + 10/13 = 7

9x = 7- 10/13

9x = (91-10)/13

9x = 81/13

x = 81/ 13 x 9

x = 9/13