Solve each system by substitution
x - y=4
x+2y=-2

Write and solve a real word problem that involves determining distance on a coordinate plane

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle

Consider the sequence below. 3 , 1 , 1/3 , 1/9 , select the explicit function which defines the sequence.