Question

For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

−x + 2y = 9
4x + 5y = 9

Answer 1

−x + 2y = 9
=>x=2y-9
4x + 5y = 9
=> 4(2y-9)+5y=9
=>8y-36+5y=9
=>13y=45
y=45/13
find x by substituting y value in x

Answer 2

in x equation

Answer 3

whats the anser ?