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I am having trouble these 2 problems in Geometry. PLEASE HELP!?
1. Indicate the equation of the given line in standard form.
The line with slope 9/7 and containing the midpoint of the segment whose endpoints are (2, -3) and (-6, 5).
2. Indicate the equation of the given line in standard form.
The line through the midpoint of and perpendicular to the segment joining points (1, 0) and (5, -2).
Thank you!!
1 Antwort
- StevenLv 7vor 8 JahrenBeste Antwort
1. Indicate the equation of the given line in standard form.
The line with slope 9/7 and containing the midpoint of the segment whose endpoints are (2, -3) and (-6, 5).
slope is 9/7
so you are going to start with
y=9x/7
the midpoint
(x1+x2)/2,(y1+y2)/2
for (2, -3) and (-6, 5)
(2-6)/2,(-3+5)/2
4/2,2/2
(2,1)
to get the line to pass through the point
SUBTRACT the values from their relative variable
y=9x/7
(y-1)=9(x-2)/7
y-1=9x/7-18/7
y=9x/7-18/7+7/7
y=9x/7-11/7
that's slope intercept
for standard
x+y=c
y=9x/7-11/7
multiply through by 7
get rid of the fractions
[always]
7y=9x-11
-9x+7y= -11
2. Indicate the equation of the given line in standard form.
The line through the midpoint of and perpendicular to the segment joining points (1, 0) and (5, -2).
perpendicular is the negative inverse of the reference line's slope
so
y=3/5
would become
y= -5/3
but we have to find the slope first
slope=m=rise over run=(y1-y2)/(x1-x2)
for (1, 0) and (5, -2)
(-2-0)/(5-1)
-2/4
-1/2
so the perpendicular is
2/1
you start with
y=2x
through the midpoint
(x1+x2)/2,(1+y2)/2
(1+5)/2,(0-2)/2
6/2,-2/2
3,1
SUBTRACT the values from their relative variables
y=2x
(y-1)=2(x-3)
y-2=2x-6
y=2x-4
again, that is slope intercept form
standard form:
-2x+y= -4