Bill has been saving $7 each week. today he spent $77of the savings, and now he has $42 left. for how many weeks has he been saving

17. Bill has been saving for 17 weeks. $77 was from 11 weeks (7×11=77), and $42 is from 6 weeks (7×6=42). $77+$42=$119, 119÷7=17

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

it is not that hard all u have to do is plot the graph

step-by-step explanation: