Is the Point on the line?

Question 1:

Does the point
(16,31)
lie on the line
y = 2x + 1
No

Question 2:

Does the point
(28,90)
lie on the line
y = 3x + 1
No

Question 3:

Does the point
(-24,21)
lie on the line
y = −x 0
No

Question 4:

Does the point
(16,-42)
lie on the line
y = −3x + 6
Yes

Question 5:

Does the point
(-15,-12)
lie on the line
y = x + 3
Yes

Question 6:

Does the point
(22,-15)
lie on the line
y = −x + 7
Yes