Question

the line given by the equation (x-y) +a(x+y) =5 is parallel to x axis then a =
i) -1
ii) 2
iii) 1
iv) None of these ​

Answer 1

Answer:

-1

Explanation:

if a line is parallel to x axis then the slope is zero

then, eqn in slope intercept form

• y = -(a+1).x/(a-1) + 5/(a-1)

• y = mx+ c

• m=0

• -a-1/a-1=0

• a=-1