Question 61234: hi. i need help.
it say's that you need write it in standard form (Ax+By=C).
this is what i have done so far.
1.(-4,1);(-2,-1)
y-2=-1-2/1-(-4)(x-(-4)
Found 2 solutions by tutorcecilia, funmath:
Answer by tutorcecilia(2152)   (Show Source):
You can put this solution on YOUR website! (-4,1);(-2,-1) [Find the slope of the line]
m=(y1-y2)/(x1-x2) [use the slope formula]
m=(1-(-1))/(-4-(-2)) [plug-in the values and solve]
m=2/-2=-1
.
Method #1: Use the point-slope form
(y-y1)=m(x-x1) [formula for the point-slope form of a line]
(y-1)=(-1)(x-(-4)) [plug-in the values and solve]
y-1=-x-4 [isolate the variables]
y=-x-4+1
y=-x-3
x+y=-3 [Standard Form of a line]
.
Method #2: Use the slope-intercept form
y=mx+b [slope-intercept form of a line]
1=(-1)(-4)+b [plug-in the values and solve for b]
1=4+b
1-4=b
-3=b [plug-in the slope and y-intercept back into the formula]
y=mx+b
y=-1x-3 [isolate the variables]
x+y=-3 [Standard Form of a line]
Answer by funmath(2933)  (Show Source):
You can put this solution on YOUR website! write it in standard form (Ax+By=C).
this is what i have done so far.
1.(-4,1);(-2,-1)
I can't follow what you've done, so I'm going to start from scratch. I assume that you have been given these two points and are being asked for the equation of the line in standard form.
In order to write the equation of a line, you need a point and a slope. So we need a slope.
To find the slope when given two points, we use the slope formula: , m=slope, (x1,y1) and (x2,y2) are the given points.
(x1,y1)=(-4,1) and (x2,y2)=(-2,-1)
Now we can use the point-slope formula to find the equation of the line: , m=slope and (x1,y1) is a given point.
m=-1 and (x1,y1)=(-4,1)
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