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Hello!

The thing to know what solving problems like these is that slopes of perpendicular lines are opposite reciprocals of each other.

For example, if you are given that the slope of a line is 6, and are told to find the slope of a line perpendicular to it, you would flip the 6/1 to 1/6 and negate it. The slope of a line perpendicular to a line with a slope of 6 is -1/6.

Here, you have an equation of a line in slope-intercept form. Slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.
In y = 4x + 5, 4 is m, thus 4 is the slope.

The opposite reciprocal of 4 is -1/4.

Answer:
-1/4

The slope of a line perpendicular to the line with equation y = 4x + 5 will be, [tex]-\frac{1}{4}[/tex].

What is a slope of a straight line?

A straight line is a combination of endless points joined on both sides of the point.

[tex]\rm m =\dfrac{y_2-y_1}{x_2-x_1}[/tex]

The slope 'm' of any straight line is given by:

The given equation in the problem is;

y = 4x + 5

The slope of the given equation is found from the standard equation of the straight line as;

y=mx+c

On comparing, we get, m = 4.

The perpendicular line slopes are reciprocals with the negative sign of each other.

Hence, the slope of a line perpendicular to the line with equation y = 4x + 5 will be, [tex]-\frac{1}{4}[/tex]

Learn more about the slope of the straight line refer;

brainly.com/question/3493733

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