In the Argand diagram (complex plane), numbers on the horizontal axis represent real numbers.
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The domain. The independent variable. The x values in a function or two variable equation. Normally, the numbers on the horizontal axis represent the data you start with to figure out what will happen when you apply a function to those numbers. In a linear equation, y=3x+2 will cross the horizontal axis at (-2/3, 0), and will cross the vertical axis at (0,2), creating a line that moves upward to the right as the values on the horizontal axis increase.
The numbers in the parenthesis represent the ordered pair for x and y. The x axis is horizontal and the y axis is vertical. When plotting the ordered pair, move across the horizontal axis for the first number and along the vertical axis for the second number.
the set of real numbers
No, it could be a qualitative variable.
The only two numbers that represent a binary digit are 0 and 1