writing equation of lines
(6,-2);m=3
what is slope?
3
write in intercept form
slope=1, y-intercept= 0
y=1x
(2,5) slope is 5
in point slope
y-y1=m(x-x1)
y-5=5(x-2)
y-5=5x-10
y=5x-5
Spot the error!
Write the equation of the line that passes through (2, 1) with slope = 4.
y=4(2)+1
y=8+1
y=9
This means the equation is y=4x+9
Number 1 is not the "b" it is the "y"
1=4(2)+b
1=8+b
-7=b
answer is y=4x-7
find b (2,4) when slope=2
y=mx+b
4=2(2)+b
4=4+b
0=b
(0,-9)'m=7
what is y axis intercept?
-9
write in intercept form
slope=4, y intercept=-4
y=4x-4
point slope
slope=8
(5,9)
y-y1=m(3,7)
y-9=8(x-5)
y-9=8x-40
y=8x-31
spot the error
write the equation of the line that passes through (5,2) with the slope of 2
5=2(2)+b
5=4+b
1=b
this means the equation is y=2x-4
The "x" and the "y" are switched
2=2(5)+b
2=10+b
-8=b
the answer is: y=2x-8
if slope was 3/4 what would be the perpendicular of it?
-4/3
write and solve in intercept form
(6,-2);=3
y=3x-20
write intercept form
slope=3, y intercept=-3
y=3x-3
point slope form
slope=4
(7,9)
y-y1=m(x-x1)
y=4x-19
spot the error
write an equation in the line in the form slope/intercept.
(8,2) m=3
2-y=3(x-8)
2-y=3x-24
the answer is -y=3x-26
the first y is not suppose to be switched its suppose to be y1
y-2=3(x-8)
y-2=3x-24
y=3x-22
slope=4 put this into a point slope of the line (3,9)
y=4x+6
write and solve in intercept form
(0,-9)'m=7
y=7x-9
write in intercept form
slope=1/2, y intercept=-1
y=1/2x-1
point slope form
slope= 9
(8,9)
y-y1=m(x-x1)
y-9=9(x-8)
y-9=9x-72
y=9x-63
spot the error
write an equation in the line in the form slope/intercept.
(2,2) slope=3
y-2=3(x-2)
y-2=3x-6
y=3x-8
the adding is wrong
find the slope of the coordinates (2,7) (3,2)
slope equals -5
write and solve in intercept form
(4,-8);m=-1/2
y=4x-6
write intercept form
slope=-3/2, y intercept=-2
y=3/2x-2
find slope then write it into a point slope form (2,4) (4,9)
slope=5/2
y=5/2x-1
spot the error!
write an equation of the line, in the form slope/intercept.
(2,3) m=-2
y-3=-2(x-2)
y-3=-2x+-4
y=-2x-1
the 4 should not be negative
making the problem y=y-2+1
find slope then put into point slope form
(4,7) (6,9)
y=1x+3