Question

y = 1/2x - 6
2x + 6y = 19

with either elimination substitution or graphing. Thanks :) these three ways of solving are really confusing

Answer 1

Let us take one at a time.....

Substitution
This is the easiest of all IF on of the equations is given as y = something. In the above case, it is. So, you take that value of y and substitute it (therefore the word substitution) in the second equation.

2x + 6(1/2*x - 6) = 19

Now, you have an equation in x that can be solved to figure out x. Then, use y = 1/2*x = 6 to figure out value of y.

Answer 2

? * ?

Answer 3

Then do i solve 2x + 6 (1/2x -6) = 19?

2x + 3x -6 = 19?

5x -6 = 19?

5x = 13? or is it 5x = 25?

Answer 4

It is 36 (6 * 6) like this:
2x + 3x -36 = 19?

Answer 5

oh yeah 6 * 6 ! so then what i was doing before but with the 36 instead?

Answer 6

Correct. Also, check my reply to that other question about elimination. Hope that helps.

Answer 7

I would subtract 36 from 19 right ?

Answer 8

or no add..

Answer 9

Add because when you have -36 and take it to the other side, you add.

Answer 10

Okay that makes sense