Question

Solve this then explain which method you used.
7x -3y=20
5x+3y=16

Answer 1

simulatneous equation lol

Answer 2

You can use elimination in this case.
Add both equations.
\(\Large \color{Black}{\Rightarrow 12x = 36 }\)
\(\Large \color{Black}{\Rightarrow x = 3 }\)

Now let's find y.

\(\Large \color{Black}{\Rightarrow 5(3) + 3y = 16 }\)

\(\Large \color{Black}{\Rightarrow 15 + 3y = 16 }\)

\(\Large \color{Black}{\Rightarrow 3y = 1 }\)
\(\Large \color{Black}{\Rightarrow y = {1 \over 3} }\)

So the correct solution set is (3,1/3)