Which systems below would be most easily solved using the substitution method?

a. 5x + 7y = 45
2x - 7y = -14

b. 2m - 3n = -2
m + 4n = 24

c. 2x = -3y + 4
x = 2y - 5

d. 7x + 2y = 16
-21x - 6y =24

The equation respenting the left table is

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

Maci and i are making a small kite. two sides are 10". two sides are 5". the shorter diagonal is 6". round all your answers to the nearest tenth. 1. what is the distance from the peak of the kite to the intersection of the diagonals? 2. what is the distance from intersection of the diagonals to the top of the tail? 3. what is the length of the longer diagonal?