Please help me! multiple choice

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?