Is x+y=1 a linear equation?

Convert 2000 swiss francs to dutch guilders

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

If u good at math hit me up on insta or sum @basic_jaiden or @ and