100 POINTS FOR ASAP ANSWER equation of a line in slope intercept form that is perpendicular to - x + y = 4 and passes through the point (-1,8).

Turn the equation into slope-intercept form.

-x + y = 4

y = 4 + x

y = x + 4

The slope of a perpendicular line is the opposite and reciprocal of the original.

x -> -x

Now, we need to find a y-intercept that crosses through the point (-1,8).

(0, 7) works

Therefore, the answer is y = -x + 7

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y = -x+7

Step-by-step explanation:

-x+y = 4

Solve for y so we can find the slope

Add x to each side

y = x +4

This is in slope intercept form

y = mx+b where m is the slope

The slope is 1

We want a line that is perpendicular.  Two lines that are perpendicular have slopes that multiply to -1

m* 1 = -1

m = -1

The line that is perpendicular has a slope that is -1

We have a slope

y = -1x +b

Substitute the point into the equation

8 = -1(-1) +b

8 = 1+b

8-1 =b

7 = b

y = -1x +7

y = -x+7

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7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: