If two lines are parallel, they have the same slope.
The slope of `y=3/4 x -1` is `3/4`
So we want a line with slope `3/4` , that goes through the point `(4,0)`
We know the slope, we want to find the y-intercept:
`y=3/4 x + b`
`0 = 3/4 (4) + b`
So: `y=3/4 x - 3`
This is the equation of the line that is parallel to `y=3/4 x -1` that passes through (4,0)
Two lines are perpendicular if you multiply their slopes and get -1. In other words, you want the "negative reciprocal"
This line has slope = 1.
So a perpendicular line would have slope = -1.
`y=-1 x + b=-x + b`
Now we need to find the y-intercept.
Plug in (-7,1)
This is the line that is perpendicular to `y=x+4` and passes through the point (-7,1)