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a) x1=-7
y1=4
m= 5
y-4=5(x+7)
y-4=5x+35
0=5x-y+35+4------------------0=5x-y+39
b) x1-1
y1=7
m=-2
y-7=-2(x+1)
y-7=-2x-2
0=-2x-y-2+7---------------------0=-2x-y+5
c) x1=5
y1=6
m=3
y-6=3(x-5)
y-6=3x-15
0=3x-y-15+6---------------------0=3x-y-9
d)x1=2
y1=1
m=-0,5
y-1=-0,5(x-2)
y-1=-0,5x+1
0=-0,5x-y+1+1--------------------0= -0,5x-y+2
e) x1=0
y1=1
m= -1,5
y-1=-1,5(x-0)
y-1=-1,5x+0
0=-1,5x-y+0+1---------------------0=-1,5x-y+1