The sets of ordered pairs below represent the cost to fix a plumbing issue based on the number of hours. The first coordinate represents the hours and the second coordinate the cost. Select the sets of ordered pairs that are proportional relationships. { ( 2 , 160 ) , ( 4 , 320 ) , ( 5 , 400 ) , ( 8 , 640 ) } { ( 2 , 160 ) , ( 4 , 320 ) , ( 5 , 400 ) , ( 8 , 640 ) } { ( 1 , 90 ) , ( 3 , 170 ) , ( 4 , 210 ) , ( 6 , 290 ) } { ( 1 , 90 ) , ( 3 , 170 ) , ( 4 , 210 ) , ( 6 , 290 ) } { ( 1 , 135 ) , ( 4 , 210 ) , ( 6 , 255 ) , ( 8 , 290 ) } { ( 1 , 135 ) , ( 4 , 210 ) , ( 6 , 255 ) , ( 8 , 290 ) } { ( 2 , 150 ) , ( 3 , 225 ) , ( 7 , 525 ) , ( 8 , 600 ) } { ( 2 , 150 ) , ( 3 , 225 ) , ( 7 , 525 ) , ( 8 , 600 ) } { ( 4 , 220 ) , ( 5 , 275 ) , ( 6 , 330 ) , ( 7 , 385 ) }