Two very different lines
The equation y = 2x + 1 draws a slanted line. The equation x = 3 draws a wall.
In the first, y depends on x.
In the second, y can be anything, but x must be 3.
One letter fixed and the other free makes a straight line every time.
Read this step as text
The equation y = 2x + 1 draws a slanted line. The equation x = 3 draws a wall.
In the first, y depends on x.
In the second, y can be anything, but x must be 3.
One letter fixed and the other free makes a straight line every time.