Discussion Forum



1)

Which of the following values of x and y satisfy the following equations I and II ?

I. 3x + y = 19              II. x - y = 9


A) -7,-2

B) -7,2

C) 7,-2

D) 7,2

Answer:

Option C

Explanation:

Given,
3x+y = 19----(1)
x-y = 9------(2)
Add two eqautions, we get,
4x = 28
$\therefore$ x = 7
Put value of x in equ. (2), we get,
y = -2
$\therefore$ the values of x and y are (7,-2) respectively