Can someone me with these maths questions? i totally don't get them. do the following coordinates lie on the following graphs? 1) y=2x+4 (7,20) 2) y=4x-14 (-1,-18) 3) y=5x-1 (0.5,2.5) 4) y=-2x+6 (0.8,5.4)

1. 2(7) +4 = 18, does not = 20, does not lie on graph

2. 4(-1) -14 = -18, equals -18, does lie on the graph

3. 5(.5)-1 = 1.5, does not = 2.5, does not lie on the graph

4. -2(0.8)+6 = 4.4, does not = 5.4 does not lie on graph

5. 1/2(0.7) +2 = 2.35, does not = 1.6, does not lie on graph

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.