Is the Point on the line?

Question 1:

Does the point
(-30,-85)
lie on the line
y = 3x + 10
No

Question 2:

Does the point
(21,78)
lie on the line
y = 4x − 6
Yes

Question 3:

Does the point
(-27,30)
lie on the line
y = −x + 4
No

Question 4:

Does the point
(26,-35)
lie on the line
y = −x − 9
Yes

Question 5:

Does the point
(-20,18)
lie on the line
y = −x − 4
No

Question 6:

Does the point
(15,-6)
lie on the line
y = −x + 6
No