piratekatie01 piratekatie01
  • 19-09-2019
  • Mathematics
contestada

Choose the equation that represents a line that passes through points (-1,2) and (3,1)
A=4x-y=-6
B=x+4y=7
C=x-4y=-9
D=4x+y=2

Respuesta :

DeanR
DeanR DeanR
  • 19-09-2019

They're all in standard form; it's probably easier just to solve for the line than check the points in each one.

The point-point form of a line through (a,b) and (c,d) is

(c-a)(y-b) = (d-b)(x-a)

So here (a,b)=(-1,2), (c,d)=(3,1) so

(3 - -1)(y - 2) = (1 - 2)(x - -1)

4y - 8 = -x - 1

x + 4y = 7

Answer: B

Check:

-1 + 4(2) = 7, good

3 + 4(1) = 7, good

Answer Link

Otras preguntas

Find the geometric mean of 3 and 75
When coding a craniectomy/craniotomy procedure, it is not uncommon that additional ____________is required?
11. Japan’s strong national identity has contributed to _____. a weak economic policy an anti-immigration policy prejudice against ethnic minorities accept
as a Chinese,how could i learn English?
What set of reflections would carry hexagon ABCDEF onto itself? a- x-axis, y=x, x-axis, y=x b- y-axis, x-axis, y-axis c- x-axis, y-axis, y-axis d- y=x, x-ax
The maturity value of a 180-day, 8.75% ordinary interest commercial loan is $83,500. Find the principal.
Which of the following groups are hurt by unanticipated inflation?
Always remember to proofread your business letters.
During the 20th century, which method led to a burst of knowledge about the nervous system?
What event occurred in the byzantine empire in the late fifteenth century that limited europe's access to spices from the east?