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t o w n & c i t y

h e l l o

CREATED & EDITED

BY MEDIA N

CREATED & EDITED

BY MEDIA N

The absolute value of a number

is its distance from 0.

2 is 2 away from zero, and −2 is also 2 away from zero.

The coordinate plane is a two-dimension surface formed by two number lines.

One number line is horizontal and is called the x-axis. The other number line is vertical number line and is called the y-axis.

The two axes

meet at a point

called the origin

A curve that turns in the downward direction is called a downward curve. It is also known as a concave downward.