A first number plus twice a second number is 5. Twice the first number plus the second totals 31.

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

What am i doing here. add?

The decimal expansion would be .27 repeated