Graph the lines y = 3x and y = x in the first quadrant (both x and y greater than or equal to 0). If y = kx bisects the angle between the lines, as shown, what is the value of k equal to?
If 6x - 4y = 8 8x = 5y + 13 Then what is the value of 6x - 3y?
Given positive real numbers x, y, and z that satisfy the following system of equations: x² + xy + y² = 9, y² + yz + z² = 4, z² + zx + x² = 1,
Find x + y + z
