If l is parallel to m solve for x and y

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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?