Is the Point on the line?

Question 1:

Does the point
(18,-8)
lie on the line
y = −x + 8
No

Question 2:

Does the point
(24,-76)
lie on the line
y = −3x 0
No

Question 3:

Does the point
(19,82)
lie on the line
y = 4x + 9
No

Question 4:

Does the point
(18,44)
lie on the line
y = 2x + 8
Yes

Question 5:

Does the point
(21,68)
lie on the line
y = 3x + 5
Yes

Question 6:

Does the point
(24,99)
lie on the line
y = 4x + 3
Yes