Question

Solve x+2y= 15 and 3x + 5y= 30 . Hence , find x/y ​

Answer 1

Answer:

(x + 2y = 15) × 3

3x + 5y = 30

3x + 6y = 45

3x + 5y = 30

- - -

___________

y = 15

x + 2(15) = 15

x +30 = 15

x = -15

x/y = -15/15

x/y = -1

Answer 2

x+2y= 15

x = 15-2y (1)

3x + 5y= 30

Apply (1) here

3(15- 2y) +5y = 30

45-6y +5y =30

45 - 30= y

15= y

so. x= 15 - 2×15 = -15

x/y = -15/15 = -1