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Well the perimeter is the straight line across the middle of the shape I would describe is a single parallel line to be my opinion
A line is a continuous, single, long mark on a paper or other substance / material that can show written or typed markings.
To describe a particular transformation fully, it means to describe what has happened to shape B to make it into shape A. In this instance, you would start off your description with "Reflection". Next, you must identify the mirror line which is between shape B and A. Make sure to mark it in. Next, you would write Mirror Line= ?? (We will replace the ?? later). Because all transformations are on graphs with co-ordinates, you will need to work out where your mirror line lies. An example would be, Mirror Line: x=2. This means the mirror line is on the 2nd sector within the X axis. Hope this makes sense. It probably is a little confusing but with a few drawn examples it would be a lot better to understand.
line
The equation of a straight line in slope intercept form is y = mx + c, where y is the y coordinate of any point, x is the x coordinate of that point, m is the slope and c is the y intercept. Therefore, the equations that correctly describe a line with a y intercept of 7 would be: y = mx + 7. The individual slope would then have to be substituted into this equation.