How would you figure this out?
2007-09-20 13:42:59 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
slope is given by
y2 - y1/(x2 - x1) =
13 - 3/( 5 - x) = 0.8
10/(5 - x) = 0.8
crossmultiply
10 = 0.8(5 - x)
10 = 4 - 0.8 x
0.8 x = -10 + 4 = -6
x = -6/0.8 = -60/8 = -15/2 = - 7.5
2007-09-20 13:54:46 · answer #1 · answered by mohanrao d 7 · 0⤊ 0⤋
the value of the slope is equal to the change in y over the change in x.
0.8=(13-3)/(5-x)
multiply both sides by (5-x) to get rid of the fraction:
0.8(5-x)=13-3
0.8(5-x)=10
then distribute
4-0.8x=10
solve for x
x=-7.5
have fun!
2007-09-20 20:55:10 · answer #2 · answered by Kristina 4 · 0⤊ 0⤋
Slope of a line = (y1-y2)/(x1-x2)
(13-3)/(5-x) = 0.8
10 = 0.8 (5-x)
10 = 4 - 0.8x
6 = -0.8x
x = -7.5
2007-09-20 20:54:23 · answer #3 · answered by norman 7 · 0⤊ 0⤋
y=mx+b (m=slope, b=y-intercept)
Plug in (5,13) and .8 and solve for b:
13=(.8)(5)+b
13=4+b
9=b
Plug in (x,3), .8, 9 and solve for x:
3=(.8)x+9
-6=.8x
-7.5=x
2007-09-20 20:55:13 · answer #4 · answered by ? 2 · 0⤊ 0⤋