Question

2x – 13 = y
- 3x + 2y = -21
what is x and y

Answer 1

x = 5 ; y = - 3

Explanation:

2x - 13 = y

2x - y =13 --------------------(i)

-3x + 2y = -21 ----------------(ii)

(i)*2 ===> 4x - 2y = 26

(ii) ===> -3x + 2y = -21

add ==> x = 5

When we are adding, -2y and 2y gives 0 or cancelled. 4x and -3x gives 1x; 26 and -21 --> different sign so subtract and put the bigger number sign. so it gives 5.

substitute x = 5 in equ (i)

2*5 - y = 13

10 - y = 13

-y = 13 -10

y = 3

y = -3