Find the value of x for which line a is parallel to line b .
2 answers:
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if we compare
a=1
b=m+n
c=mn
if b is negative and c is positive then
m+n<0 and mn>0
let's look at the 2nd one
mn>0
that means either m and n are both positive or both negative
look at the other one
m+n<0
if they are both positive, this is false
if they are both negative, this is true
therefor m and n are both negative
if we compare
a=1
b=m+n
c=mn
if b is negative and c is positive then
m+n<0 and mn>0
let's look at the 2nd one
mn>0
that means either m and n are both positive or both negative
look at the other one
m+n<0
if they are both positive, this is false
if they are both negative, this is true
therefor m and n are both negative