Question

Choose one value of x that proves that the student's claim is not true.

Answer 1

option b i.e -2

y=2x+5 (given)

Now, when x = -2

y=2(-2)+5

= -4+5

=1

The student claims that when x is (-) ve then y is also (-) ve, which is not true when x=-2

because here x is (-) ve and y is (+) ve