Hi folks! Certainly glad this forum exists
I'm following on how to do this till the very last step where -x1 is on the left and -x2 is on the right. I don't understand why one can simply remove both negatives or why they would negate each other on opposite sides of the equation?
Here's the the question and solution:
x1 & y1 and x2 & y2 are two points on a non-vertical line. X1 does not equal x2. The slope (M) of the line is:
Multiply on both sides, and divide M on both sides to begin isolating x1.
solve for x1
,Then, by subtracting from both sides of the equation, we get
The 2nd to last step, both x's are negative. The last step they're positive. I'm not understanding how they remove them. Is it because it is representing a line that crosses the negative side to the positive side?
Many thanks for any help!