Arrange the systems of equations that have a single solution in increasing order of the x-values in their solutions. 2x + y = 10
x − 3y = -2
x + 2y = 5
2x + y = 4
x + 3y = 5
6x − y = 11
2x + y = 10
-6x − 3y = -2

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?