Emma sold three times as many magazines as vada. robbie sold two less than twice the number of magazines that emma sold. they sold 138 magazines how many. magazines the vada sell?

E + V + R = 138
E = 3V
R = 2E - 2R = 2(3V) - 2R = 6V - 2

3V + V + 6V - 2 = 138
10V - 2 = 138
10V = 138 + 2
10V = 140
V = 140/10
V = 14 <=== Vada sold 14 magazines

E = 3V
E = 3(14)
E = 42 <=== Emma sold 42 magazines

R = 6V - 2
R = 6(14) - 2
R = 84 - 2
R = 82 <=== Robbie sold 82 magazines

the image of (6, 9) under a dilation is (4, 6). the scale factor is

b. 2/3