Idon't get this at all , need asap you

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )