The number line shows the elevation of the bottom of a harbor and the elevation of a fish swimming close to the surface. A vertical number line labeled "Elevation (m)" goes from –12 to 2 by twos. Zero is labeled "sea level." There is a mark at negative 1.5 labeled "–1.5 meters" with an icon of a fish and another mark at negative 10.5 labeled "–10.5 meters bottom

What change in elevation is necessary for the fish to reach the bottom?

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step-by-step explanation:

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b

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