What is an equation of the line that passes through the point (6,1) and is parallel to the line x+3y=15

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Point r divides in the ratio 1 : 5. if the coordinates of e and f are (4, 8) and (11, 4), respectively, what are the coordinates of r to two decimal places?

In the diagram below,abc is congruent to dec what is the value of x