#Lines
48 messages · Page 1 of 1 (latest)
what is the slope of line E
mhm
also you can find the x intercept of line P
then you can use point-slope and convert to slope-intercept
X intercept is 7/3
If they are perpendicular this means the product of 3x and m equals -1
I dont understand
Its a rule in mathematics
If two lines are perpendicular to each other then the product of the number that gets multiplied by x and same for the other line aquals -1
Wait ill send a picture for u to under stand
@arctic fossil
So what is the equation of line E. @plush steppe
We have (D): y=7-3x
And (E): y=mx +c
Since they are perpendicular
-3 x m = -1
So m= 1/3
For c you need the coordinates of a point that is in the line E
I dont have a point and whenever I try and calculate P it gives me some cracked answer
@arctic fossil did they give you the coordinates of a point that is in line E
P is c in our case right?
So they didnt give the coordinates of it
No
Its kinda hard with no coordinates but i can notice that the coordinates of P(x;0) since p is in the x axis
I did a try
Aldo there is an intersection between line (E) and y axis
We can say the corrdinates of this point is K (0;y)
Then calculate m
m =y1 - y2/x1-x2
= y-0/0-x
= y/-x
We already knew m = 1/3
And m=y/-x
So y/-x=1/3
Y= 1 and -x=3 so x=-3
Y=1/3x+c
1=1/3 x (-3)+ c
C=2
So (E): y=1/3x+2
Thats what i think it could be wrong
y = -3x+7
m = -3
m × m' = -1
-3 × m' = -1
m' = 1/3
y = (1/3)x+c
x-intercept -> y = 0
=> 0 = 7-3x
=> 3x = 7
=> x = 7/3
0 = (1/3)(7/3)+c
0 = (7/9)+c
c = -7/9
y = (1/3)x-(7/9)
thanks
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