m: y=-2x+4
<u>slope: 2</u>
2/1=2
Its negative because the line is going down from left to right
<u>y-intercept:</u>
it crosses the y axis at (0,4)
n: y=x-1
<u>slope: 1</u>
1/1=1
Its positive because the line is going up from left to right
<u>y-intercept:</u>
it crosses the y axis at (0,-1)
l: y=4
<u>slope: 0</u>
A vertical line's slope is always 0
<u>y-intercept:</u>
it crosses the y axis at (0,4)
p: x=-4
To find the equation for a horizontal line, you need to find what x always is no matter what.
You just need to plug those expressions inside the formula: it doesn't matter if they're expressions involving a variable instead of plain numbers: the formula becomes
If you want, you can simplify it by expanding the square and then multiply the two parenthesis: