[6.02] 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

[6.02] 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

kropot72 · Answer

4x - y =8
The first step to isolate y is to subtract 4x from both sides of the equation. Can you do that?

kropot72 · Answer

@Mrszbieberxo Are you there?

anonymous · Answer

yes I got infinitely many solutions

kropot72 · Answer

Can you please do the step that I gave previously.
4x - y =8
The first step to isolate y is to subtract 4x from both sides of the equation. Can you do that?

anonymous · Answer

y=4?

kropot72 · Answer

Not really. Subtracting 4x from both sides gives:
4x - y - 4x = 8 - 4x ...............(1)
Can you simplify the left hand side of (1)?

anonymous · Answer

I'm sorry i'm really confused :/

kropot72 · Answer

We are looking at simplifying the left hand side of 
4x - y - 4x = 8 - 4x ...............(1)
If the terms on the left hand side are rearrangedas follows is the simplification clearer?
(4x - 4x) - y = 8 - 4x 
Hint: What is 4x - 4x ?

kropot72 · Answer

rearranged as*