The point (1,2) is on a line with a slope of -3. the coordinates of another nearby point on the line are write your answer using parentheses, no spaces, /! : a comma between the numbers

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?