Question

11x+15y= -23
7x-2y = 20
by elimination method (linear equation in two variable)​

Answer 1

Answer:

x = 2 and y = -3

Step-by-step explanation:

11x + 15y = -23 --(i)

7x - 2y = 20 --(ii)

11x + 15y = -23 } ×2

7x - 2y = 20. } ×15

22x + 30y = -46 --(iii)

105x - 30y = 300 --(iv)

By elimination method (iii) + (iv)

(22x + 30y) + (105x - 30y) = (-46) + (300)

22x + 30y + 105x - 30y = -46 + 300

127x = 254

x = 254/127

x = 2

finding y

in --(i)

11x + 15y = -23

11×2 + 15y = -23. (putting the value of x)

22 + 15y = -23

15y = -23 -22

15y = -45

y = -45/15

y = -3