How do you make certain that the major points of your speech are clear?
list them in your introduction.
emphasize them as they occur in your speech.
mention them in your conclusion.
all of the above

In this question all of the above-mentioned choices are applicable. There is a need for you to list the major points at the beginning of your speech in order to remember them, arrange them in the order of importance in the discussion of each part, and giving a conclusion about them gives room for questions from the audience and clarifications from you should the need calls for it.

x=4, y=4

step-by-step explanation:

y=2x-4;

x+2y=12

we can use substitution since the first equation is solved for y

where ever you see y in the second equation, replace it with 2x-4

x + 2(2x-4) = 12

distribute the 2

x+4x-8 = 12

combine like terms

5x-8=12

add 8 to each side

5x-8+8=12+8

5x=20

divide by 5

5x/5 = 20/5

x =4

we still need to solve for y

y = 2x-4

we know x =4

y = 2(4) -4

y = 8-4

y=4