Question

-3x + 4y = 20
6x + 3y = 15

Answer 1

x = 0

y = 5

Explanation:

-3x + 4y = 20 -------------(i)

6x + 3y = 15 --------------(ii)

(i) * 2 - 6x + 8y = 40

(ii) 6x + 3y = 15 (Now add, x will be eliminated}

11y = 55

y = 55/11

y = 5

Plug in y =5 in equation (i)

-3x + 4*5 = 20

-3x + 20 = 20

-3x = 20 - 20

-3x = 0

x = 0