Show how to use elimination matrices to solve the following system of equations. Please give your final solution as either a point, no solution, or a set of solutions: x - y - 2z = -1
-2x+2y+4z = 2
-2x+3y+z = 7

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Me with geometry ! in this figure, bc is a perpendicular bisects of kj. dm is the angle bisects of bdj. what is the measure of bdm? •60° •90° •30° •45°