SOLUTION: The line y = ax + 7 is parallel to the line y = 2x - 3. The line y = bx + 7 is perpendicular to the line y = 2x- 3. a) State the value of a and of b. b) Calculate the perpendicul

Algebra ->  Coordinate-system -> SOLUTION: The line y = ax + 7 is parallel to the line y = 2x - 3. The line y = bx + 7 is perpendicular to the line y = 2x- 3. a) State the value of a and of b. b) Calculate the perpendicul      Log On


   



Question 389037: The line y = ax + 7 is parallel to the line y = 2x - 3. The line y = bx + 7 is perpendicular to the line y = 2x- 3.
a) State the value of a and of b.
b) Calculate the perpendicular distance between the pair of parallel lines.
*Please solve this question and explain it in detail. Also explain your answers in as much detail as possible, especially part (b). Thanks :)*

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi,
Note: the standard slope-intercept form for an equation of a line is y = mx + b
where m is the slope and b the y-intercept.
a) State the value of a and of b.
y = ax + 7 is parallel to the line y = 2x - 3 (lines have same slope)
a = 2 y = 2x + 7
The line y = bx + 7 is perpendicular to the line y = 2x- 3.
Perpendicular lines have Slopes that are negative reciprocals of one another:
b = -1/2 y = -.5x + 7
b) Calculate the perpendicular distance between the pair of parallel lines.
graphing
y = 2x - 3 and y = 2x + 7 and the line perpendicular to both: y = -.5x + 7
Distance between Pt(0,7) and Pt(4,5)would be:
sqrt%28%28x%5B2%5D+-+x%5B1%5D%29%5E2+%2B+%28y%5B2%5D+-+y%5B1%5D%29%5E2%29
sqrt%28%284+-+0%29%5E2+%2B+%285+-+7%29%5E2%29
sqrt%28%284+-+0%29%5E2+%2B+%285+-+6%29%5E2%29
sqrt%28%284%29%5E2+%2B+%28-2%29%5E2%29
sqrt%2820%29=+highlight%284.472%29