Here the equation given to us is,
Now what we have to do is, we have to put the value of x in brackets () in both the equations . Why we have to put value of x in a bracket?
This is because 2 is being multiplied by the variable x. So let's solve the equations
a) When x = 5, what is the value of y?
Put the value of x here
y = 2x + 1
y = 2(5) + 1
y = 10 + 1
y = 11
b) When x = -5, what is the value of y?
y = 2x + 1
y = 2(-5) + 1
y = -10 + 1
y = -9
ANSWERS :-
a) y = 11
b) y = -9