Which relation is a function? * O (1,3), (3, 5), (5,7), (7.9). (9,1)
O (4,1), (8, 2), (8,3), (16,4), (-7,6)
O (-4,6), (0,6), (-7, 6), (4, 6), (-7,8)
O (-2,3), (0,3), (4,-2), (4,6), (2,-2)

I'm sure the answer is a

(6,1)(5,4)slope = (4 - 1) / (5 - 6) = 3/-1 = -3y = mx + bslope(m) = -3use either of ur , = 6 and y = 1now sub and find b, the y int1 = -3(6) + b1 = -18 + b1 + 18 = b19 = bso ur equation is : y = -3x + we need it in standard formy = -3x + 3x to both sides3x + y = 19 < == standard form