Question

What is the answer to this question ? please answer this !! Will mark Brainliest answer !

Answer 1

Answer:

The correct answer is D.

Step-by-step explanation:

We need to find the slope of 3x-4y=20.

3x-4y=20

-4y=-3x+20

y=(3/4)-5

Perpendicular lines will always have negative reciprocals, so we need to find a line that has a slope of -4/3 ( flip the numbers and add a negative) and passes through the points (1,-1). We can use the point-slope formula.

y-y1=m(x-x1), where m is slope.

Substitute values.

y-(-1)=(-4/3)(x-1)

Simplify

y+1=(-4/3)x+(4/3)

Multiply both sides by 3

3y+3=-4x+4

Add 4x

3y+4x+3=4

Subtract 3

3y+4x=1

The correct answer is D