Question

Which number is a solution of -2x < -4?
a.
-2
c.
1
b.
0
d.
10

Answer 1

Just know that if a<b, then -a>-b
Or, if -a<-b, then a>b
Just Multiply both side of the inequality by -1 and change the - sign into + sign
Then divide both side by 2
You'll find x>2
Therefore,the answer is 10, 'cause among the answers given, only 10 is greater then 2

Answer 2

Also, notice that the < sign changes into > sign