Question

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

y = 10x - 9
y = x + 18

A. (4, 31)
B. (3, 21)
C. (1, 1)
D. (2, 11)

Answer 1

http://openstudy.com/users/parthkohli#/updates/4fa7aa68e4b029e9dc388281 See this tutorial, after that, see my method:

\(\Large \color{purple}{\rightarrow x + 18 = 10x - 9 }\)

\(\Large \color{purple}{\rightarrow x + 27 = 10x }\)

\(\Large \color{purple}{\rightarrow 9x = 27 }\)

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

Now, y = x + 18. We can infer:

\(\Large \color{purple}{\rightarrow y = 3 + 18 }\)

\(\Large \color{purple}{\rightarrow y = 21 }\)

Hope this helps :)

Answer 2

yeaa it do I just be wanting tosee if I have the correct answers