You first of all plot the line x = 7.
Since it says "x equals seven". Go out to where 'x equals 7'
on the x-axis, and draw a vertical line through it, like the
green one below:
Now plot the point (-4,3), which is the red point below:
Now draw a red line through it parallel to it..
Now think about this. If the green line's equation is
x = 7
because it is a vertical line that goes through the point
on the x-axis where x equals 7,
Then what would you suspect the equation of a vertical line
that goes through the point on the x-axis where x equals -4,
would be?
Answer: x = -4
If you're wondering about the 3 in (-4,3)? and why you did
nothing with it, just realize that the line would have been
the same line regardless of what number was where the 3 is.
Edwin
