Abscissa is:
a. the first number (or x value) of an ordered pair coordinate plane
b. a way of locating points in a plane that consists of a horizontal and a vertical number line intersecting at the zeros coordinates
c. an ordered pair, (x, y), that describes the location of a point in the coordinate plane ordinate
d. the second number (or y-value) of an ordered pair origin
e. the point of intersection, (0, 0), of the axes in the coordinate plane quadrant
f. region in the coordinate plane x-axis
g. the horizontal axis in the coordinate plane y-axis
h. the vertical axis in the coordinate plane

The first number (or x value) of an ordered pair.

Step-by-step explanation:

Abscissa is the first number (or x value) of an ordered pair.

A coordinate plane is a way of locating points in a plane that consists of a horizontal and a vertical number line intersecting at the zeros.

Coordinates are an ordered pair, (x, y), that describes the location of a point in the coordinate plane.

Ordinate is the second number (or y value) of an ordered pair.

Origin is the point of intersection, (0, 0), of the axes in the coordinate plane.

A quadrant is a region in the coordinate plane.

X axis is the horizontal axis in the coordinate plane.

Y axis is the vertical axis in the coordinate plane.

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9