6,000 meters, the density of the air decreases by approximately 0.1 kilograms/cubic meter for each of the next

1,000 meters.

Suppose the slope of a line were to increase. Graphically, that means it would get steeper. Suppose the slope of

a line were to decrease. Then it would get flatter. These conditions are true whether or not the slope was

positive or negative to begin with. A higher positive slope means a steeper upward tilt to the line, while a

smaller positive slope means a flatter upward tilt to the line. A negative slope that is larger in absolute value

(that is, more negative) means a steeper downward tilt to the line. A slope of zero is a horizontal flat line. A
vertical line has an infinite slope.

Suppose a line has a larger intercept. Graphically, that means it would shift out (or up) from the old origin,

parallel to the old line. If a line has a smaller intercept, it would shift in (or down), parallel to the old line.

Solving Models with Algebra
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