2006-08-02 01:23:04 · 10 answers · asked by wicked 1 in Science & Mathematics ➔ Mathematics
Y= mX + b
m is the slope, which you know is -4, so you can substitute that in.
Y= (-4)X + b.
You also have a point, which you can substitute in...
Y= 3
X= (-2)
3= (-4)(-2) + b
Solve for B
3= 8 + b
b= -5
Substitute back into your original equation
Y= mX + b
Y = (-4)X - 5
Alternatively, you know that b is the Y intercept (X = 0). And you know that the slope is -4. That means that for every unit X increases, Y will decrease by 4. Your point is (-2, 3), and at the Y intercept, X = 0. So if X is increasing by 2 and the slope is -4, Y will decrease by 8.
3 - 8 = -5, which means that a point on the line is (0,-5), the Y intercept.
2006-08-02 01:34:24 · answer #1 · answered by 006 6 · 3⤊ 0⤋
slope intercept type: y=mx+b, the situation m is the slope and b is the y intercept(the situation the line crosses the y axis) so your subject aspects each and every subject different than b so located all that for the time of to discover b: remember, factors are written (x,y). -9= -5(3)+b multiply: -9= -15+b upload 15 to each facet. you attempt to get b on one facet and what you do to a minimum of one facet you may desire to do to distinctive: 6=b. now you have b and m, so those are constants on your line. x and y replace because of the fact the standards replace. very final equation: y= -5x+6 now, attempt the others: 8= -4(a million)+b 12=b so y= -4x+12 -2=a million/2(4)+b -2=2+b b=-4 so y=a million/2x-4
2016-12-11 05:00:29 · answer #2 · answered by Anonymous · 0⤊ 0⤋
y=mx+c
Substitute x with -2
y with 3
and m with -4
sol: 3=-4(-2)+c
3=8+c
c=-5
therefore y= -4x-5
2006-08-02 02:55:53 · answer #3 · answered by U know who 3 · 0⤊ 0⤋
3 = -4(-2) + b
3 = 8 + b
-5 = b
y = -4x - 5
4x + y = -5
2006-08-02 04:15:58 · answer #4 · answered by jimbob 6 · 0⤊ 0⤋
m=-4 y=mx+b so 3=-2*-4+b solve to find that b=-5
so the eqn is y= -4x-5.
2006-08-02 01:29:04 · answer #5 · answered by Anonymous · 0⤊ 0⤋
formula is y-y1=m(x-x1) and substituting
(y-3)=-4{x-(-2)}=>y-3=-4x-8 and
the equation is 4x+y+5=0
2006-08-02 02:33:21 · answer #6 · answered by raj 7 · 0⤊ 0⤋
(-2,3), m = -4
3 = -4(-2) + b
3 = 8 + b
b = -5
ANS : y = -4x - 5
2006-08-02 04:02:10 · answer #7 · answered by Sherman81 6 · 0⤊ 0⤋
Is using answers ethecally right to solve your homework problems? If it is the answer is so is y= -4x-5. :)
2006-08-02 01:35:34 · answer #8 · answered by Sleemur 1 · 0⤊ 0⤋
y=mx + c
y=-4x+c
3=8+c
c=-5
so equation is y= -4x-5.
pick me.
2006-08-02 03:13:43 · answer #9 · answered by sk_yahoo 2 · 0⤊ 0⤋
y=-4x+c
____ 3 = -4(-2) +c
____ 3 = 8 + c
____ -5 = c
____ Therefore, y = -4x - 5
2006-08-02 01:29:25 · answer #10 · answered by enghwa9 1 · 0⤊ 0⤋