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

4x − y = 8
2x + 3y = 9

Question

For the following system, if you isolated y in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

4x − y = 8
2x + 3y = 9

anonymous · Answer

From First equation : $$y = 4x - 8$$

Put it in second equation, we have

$$2x + 3(4x - 8) = 9$$
$$2x + 12x - 24 = 9$$
$$14x = 9+24$$
$$x = 33/14$$

And therefore,

y = 10/7..
Understood or not???