Her final answer should have been x = 1/2.
Her 2 errors were that she didn't distribute the 2x to both 4 and -17 and that she made the 13 positive instead of negative when she added 4 and -17 together.
The negatives on both sides cancel each other out
x = 1/2
This is where Lin's first mistake appears, 4-17 is -13, not positive 13.
Next, Lin distributes.
This is right with Lin's equation, since Lin got 13 instead of -13.
However, if we were doing it correctly from the start, it should be:
Okay, after 8x-24+7=26x Lin simplifies again to:
She then tries to eliminate 8x.
What she does wrong here, is that she subtracts 8x from the left, and adds 8x to the right.
This makes it so that the equation is not equal anymore, because what you do to one side, you must do to the other.
This is Lin's second mistake.
What she should have gotten is
Okay, now that we have found her mistakes, let's solve this correctly.
Add 17 to both sides.
Add 26x to both sides.
Her answer should have been 1/2.
yes because there is exactly one y value for every x value
for function there can't be more than one value for every x value