Which rational expression is undefined when a = 1 ? (6a ^ 2 - 6)/(7a + 7) (8a ^ 2)/(5a - 10) (10a + 6)/(- a ^ 2 + 1) (9a - 3)/(3a ^ 2) Please help

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for

Is there a picture?

With out knowing the functions you have to chose form, this could be one.y = 5.00xx = hours worked and y = the money he will earn.