How can i solve the following system of equations: -4x + y= 6, -5x -y =21. i know i can cancel out but i don't know where or where to go from there.

Yahir designs bracelets. he uses between 9 and 15 red and yellow beads in the ratio of 2 red bead to 5 yellow beads. drag the beads into the container to meet these requirements

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.

Keith runs 5 miles in 38 minutes. at the same rate, how many miles would he run in 57 minutes