Answer:
(8,48) and (13,78)
Step-by-step explanation:
For following (t,r) points we use try and mistake method
(7,44) --> t=7, r=44 --> r=6t --> 44=6*7 --> 44=42 (both sides not equal) --> point (7,44) doesn't lie
(8,48) --> t=8, r=48 --> r=6t --> 48=6*8 --> 48=48 (both sides equal) --> point (8,48) lie
(9,52) --> t=9, r=52 --> r=6t --> 52=6*9 --> 52=54 --> (both sides not equal) --> point (9,52) doesn't lie
(12,74) --> 74=6*12 --> 74=72 --> point (12,74) does't lie
(13,78) --> 78=6*13 --> 78=78 --> point (13,78) lie
