/sci/ - Science & Math

Got this graph, and i'm asked to sort in increasing order [math]a_i[/math], (form of the function is the usual linear function: [math]f_i=a_ix+b_i[/math]i also have to know if there are repeated values in [math]a_i[/math] and [math]b_i[/math], i suppouse there are repeated values in [math]b_i[/math] because [math]f_1, f_4[/math] intersect in the same spot in the Y axis. How the fuck do i know if [math]a_i[/math] has repeated values? i suppouse that the only two cases i could contemplate as repeated are [math]f_1, f_4[/math] because they have a positive inclination, but anyways, how the fuck do i do this crap?

I have the following graph, as you may see, this graph doesn't have the values for both X and Y axis.

I'm being asked if there are repeated values in any [math]a_j[/math] and in any [math]b_j[/math] i suppouse that both [math]f_1, f_4[/math] have the same value in [math]b_j[/math] because they intersect in the same place in the Y axis, right? how do i solve this crap?