SOLUTION: 1.Find the slope, given the two points (-7/5, 3/10) and (1/5, -1/2). 2. Write the equation of the line that is parallel to 3x = 4y + 5 and passes through the point (2, -3).

Algebra ->  Linear-equations -> SOLUTION: 1.Find the slope, given the two points (-7/5, 3/10) and (1/5, -1/2). 2. Write the equation of the line that is parallel to 3x = 4y + 5 and passes through the point (2, -3).      Log On


   



Question 73626: 1.Find the slope, given the two points
(-7/5, 3/10) and (1/5, -1/2).

2. Write the equation of the line that is parallel to 3x = 4y + 5 and passes through the point (2, -3).

Answer by funmath(2933) About Me  (Show Source):
You can put this solution on YOUR website!
1.Find the slope, given the two points
(-7/5, 3/10) and (1/5, -1/2).
When given two points and asked for a slope, use the slope formula:highlight%28m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29%29, m=slope, (x1,y1) and (x2,y2) are the given points.
(x1,y1)=(-7/5,3/10) and (1/5,-1/2)
m=%28-1%2F2-3%2F10%29%2F%281%2F5-%28-7%2F5%29%29
m=%28-1%2F2-3%2F10%29%2F%281%2F5%2B7%2F5%29
m=%28%28-1%2F2%29%285%2F5%29-3%2F10%29%2F%281%2F5%2B7%2F5%29
m=%28-5%2F10-3%2F10%29%2F%281%2F5%2B7%2F5%29
m=%28-8%2F10%29%2F%288%2F5%29
m=%28-8%2F10%29%2A%285%2F8%29
m=-40%2F80
highlight%28m=-1%2F2%29
:

2. Write the equation of the line that is parallel to 3x = 4y + 5 and passes through the point (2, -3).
In order to wirte an equation of a line, you need a point and a slope. They gave you the point, you need to find the slope. Parallel lines have equal slopes. You have the equation of a parallel line. To find its slope, put it in slope intercept form. highlight%28y=mx%2Bb%29, m=slope, (0,b)=y-intercept.
3x=4y%2B5
3x-5=4y%2B5-5
3x-5=4y
3x%2F4-5%2F4=4y%2F4
%283%2F4%29x-5%2F4=y
y=%283%2F4%29x-5%2F4
The coefficient of x is your slope. m=3/4
Now that you have both a slope and a point, you can use the point slope formula to find the equation of the line. highlight%28y-y%5B1%5D=m%28x-x%5B1%5D%29%29, m=slope and (x1,y1) is the given point.
m=3/4 and (x1,y1)=(2,-3)
y-%28-3%29=%283%2F4%29%28x-2%29
y%2B3=%283%2F4%29%28x-2%29
4%28y%2B3%29=4%283%2F4%29%28x-2%29
4y%2B12=3%28x-2%29
4y%2B12=3x-6
4y%2B12-12=3x-6-12
4y=3x-18*
-3x%2B4y=3x-3x-18
-3x%2B4y=-18
-1%28-3x%2B4y%29=-1%28-18%29
highlight%283x-4y=18%29 This is the general or standard form of the equation of the line.
*If you need the slope intercept form of the equation of the line, solve for y.
4y=3x-18
4y%2F4=3x%2F4-18%2F4
highlight%28y=%283%2F4%29x-9%2F2%29
Happy Calculating!!!!