Question

Value of x and y
11x+15y=-23
7x-2y=20

Answer 1

Answer:

11x+15y=-23.... (1)by 2

7x-2y=20......(2)by15

22x+30y= - 64

105x-30y=300

Subtracting eqn (1)&(2)

-75x=-364

x=-4. 853333...

Put the value of the equ (1)

11×4.9+15y=-23

53.9+15y =-23

15y=-23-53.9

15y=-30. 9

y=-30.9/15

y=2.06

Answer 2

Answer:

x = 2, y = -3

Step-by-step explanation:

7x-2y=20

7x-20=2y

y= 7x-20/2

therefore,

11x+15y= -23

putting y value

11x+15(7x-20/2)= -23

11x+(105x-300/2)= -23

adding both

22x+105x-300/2= -23

127x-300/2= -23

127x-300= -46

127x= -46+300

127x= 254

x= 2

now putting the value of x in the equation 7x-2y= 20

7*2 -20= 2y

-6=2y

therefore,

y = -3