System of equations and its solution are given below.

system a

5x - y= -11
3x - 2y=-8

solution (-2,1)

to get system b below, the second equation in system a was replaced by the sum of that equation and the first equation in system a multiplied by -2.

system b

5x - y = -11
?

2222222222222222222

step-by-step explanation:

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation:

a = 3.14

b = 18

c = 18/5 or 3.6 or 3 3/5

step-by-step explanation: