Answer:
Answer is 12 isnt it
Step-by-step explanation:
12×4=48
48+9=57
- Slope formula:

Firstly, let's set up our equation. Place the two coordinates in the slope formula and have it equal 8: 
Next, combine like terms: 
Next, multiply both sides by 7: 
Next, add 4 onto both sides of the equation: 
Lastly, divide both sides by 2 and <u>your answer will be
</u>
This is TRUE!
The definition for perpendicular only applies when the lines are at a right angle which is 90°
The first line is perpendicular, the second line is not perpendicular and not parallel , the third line is parallel to the above line and the forth line not parallel or perpendicular to the line.
<h3>How can the slope of the line be calculate?</h3>
The slope of the line is been given as −3x+5y=−15
Then
, hence the slope is 
- Slope of the first line 5x + 3y = 15 after calculation is
the slope is 
this means that the line is perpendicular to the given line
- Slope of the second line 3x + 5y = 15 after calculation is

This means that the line is not perpendicular and not parallel
- Slope of the Third line -3x + 5y = 15 can be calculated as

This means that the line is parallel to the above line.
- Slope of the first line 3x + 5y = 15 after calculation is

This means that the line is not parallel or perpendicular to the line
Learn more about slope of line at:
brainly.com/question/3493733
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