Write an equation for the line perpendicular to the y-axis through the point (4,-10)

y = - 10

Step-by-step explanation:

A line perpendicular to the y- axis is a horizontal line parallel to the x- axis.

The equation of a horizontal line is

y = c

where c is the value of the y- coordinates the line passes through.

The line passes through (4, - 10) with y- coordinate of - 10, thus

y = - 10 ← is the equation of the line

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b) the dogs need to shift their focus to human scent.