Question

Use the substitution method to solve the system of equations. Choose the correct ordered pair.

x + 2y = 12
y = x + 3

A. (5, 8)
B. (2, 5)
C. (2, 1)
D. (5, 2)

Answer 1

You can substitute y or x. I suggest you pick y because the second equation is already solved for y
All you have to do is isolate the y in the first equation. Can you do that?

Answer 2

tHAT WOULD GIVE ME B RIGHT? OR WRONG?

Answer 3

right

Answer 4

Did you just guess?

Answer 5

NO

Answer 6

oh ok well good job then.

Answer 7

\(\Large \color{purple}{\rightarrow x + 2(x + 3) = 12 }\)

I replaced y with x + 3 as we already know y = x + 3

Answer 8

\(\Large \color{purple}{\rightarrow x + 2x + 6 = 12 }\)

\(\Large \color{purple}{\rightarrow 3x + 6 = 12 }\)

\(\Large \color{purple}{\rightarrow 3x = 6 }\)

\(\Large \color{purple}{\rightarrow x = 2 }\)

Answer 9

http://openstudy.com/users/parthkohli#/updates/4fa7aa68e4b029e9dc388281

See this tutorial for more.