Robert Recorde, in 1557. See link for more details.
His reason was that nothing represented equality better than two parallel equal lines.
That means the line is horizontal. It runs parallel to the X axis.
0 equals Equator on The Meridian Line (0 degrees)
you mean c? haha pythagoras
X=5 is a vertical line, so it has no slope. When I say it has no slope, I don't mean the slope is 0, I mean the slope is nonexistent.
y equals 4x+1 is a parallel line to y equals 4x.
No, they are perpendicular.
It was invented in the 20th century
Some line dances were invented in the 1950's. But, most were invented in the 1970's.
If you mean 90 times 2 then it equals 180 if you know your angles, you know to 180 degrees is —- just a line. And if you count by 90, it goes like this; 90,180.
If you mean y = -1x +14 then it is a sraight line graph whereas -1 is the slope and 14 is the y intercept
a line that equals to my BEEP
Max Factor invented the first line of packaged cosmetics.