Which system of linear inequalities is represented by the graph

The rows and columns of lattice points in a three-by-three square array are evenly spaced one unit apart. how many distinct triangles with at least one side of length 2 units can be drawn using three lattice points for the vertices?

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8