Expand the following:
3/8(16x-24)

 The required expanded form is 6x-9.

Step-by-step explanation:  We are given to expand the following expression :

We know that, for any real numbers a, b and c, we have

So, from expression (i), we get

Thus, the required expanded form is 6x-9.

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18