Coordinate graphing4/12/2024 ![]() ![]() ![]() In other words, its ?x?-coordinate is ?0? and its ?y?-coordinate is ?0?. The origin is the center of the coordinate system, so its coordinates are ?(0,0)?. Similarly, the ?y?-coordinate of a point is positive if the point is located above the ?x?-axis, negative if it’s located below the ?x?-axis, and ?0? if it’s located on the ?x?-axis. The ?x?-coordinate of a point in the plane is positive if the point is located to the right of the ?y?-axis, negative if it’s located to the left of the ?y?-axis, and ?0? if it’s located on the ?y?-axis. The first number in the ordered pair is the ?x?-coordinate, and the second number is the ?y?-coordinate. A pair ?(x,y)? is actually called an ordered pair, because the order of the numbers ?x? and ?y? matters. We represent every point in the plane by a pair of numbers ?(x,y)?, called its coordinates, where ?x? (called the horizontal coordinate or the ?x?-coordinate) is the horizontal (left-right) location of the point (think “?x? marks the spot on the ground” to help you remember), and ?y? (called the vertical coordinate or the ?y?-coordinate) is the vertical (up-down) location of the point (think “?y? to the sky”). Here is what youll need to know: The x-axis goes left and right, the second coordinate is on the y-axis. When youre graphing a point on the coordinate plane, you will graph it in (x, y) form. Similarly, we call the part of the ?y?-axis that’s above the origin the positive ?y?-axis, and the part that’s below the origin the negative ?y?-axis. Understand the axes of the coordinate plane. Also, we call the part of the ?x?-axis that’s to the right of the origin the positive ?x?-axis, and the part that’s to the left of the origin the negative ?x?-axis. We draw arrows at the ends of the axes to indicate that they extend forever. We sometimes refer to them, together, as the coordinate axes. We call the horizontal axis the ?x?-axis, and the vertical axis the ?y?-axis. It’s made up of a pair of perpendicular lines - one horizontal and the other vertical - called axes, and the point where they meet, called the origin. ![]()
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