For the following system, use the second equation to make a substitution for y in the first equation.

2x + y = 6
y = 3x + 4

What is the resulting equation?

y + 2x + y = 6
2x + y + 3x + 4 = 6
2x + (3x + 4) = 6

Question

For the following system, use the second equation to make a substitution for y in the first equation. 

2x + y = 6
y = 3x + 4

What is the resulting equation?


y + 2x + y = 6
2x + y + 3x + 4 = 6
2x + (3x + 4) = 6

terenzreignz · Answer

Your thoughts?
y = 3x + 4 in the second equation, so the whole point of this was to replace the y in the *first* equation with the y-value in the *second* equation...

anonymous · Answer

It should be 2x+(3x+4) = 6.  They are basically telling you what y equals in the second equation, you just have to plug it in for y.