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a)
y= -3x +6
0= -3x + 6
-6=-3x /÷(-3)
x= 2
b)
-3x+6 < 0
-3x< -6 /÷ (-3)
x >2 x∈ (-∞,2)
c) y=-3x+6 P(-3,4)
y= ax +b
a₁×a₂= -1
a₂= -1/a₁= -1/-3=⅓
y₂= ⅓x+b
4=⅓×(-3)+b
4=-1+b
b=1+4=5
y₂= ⅓+ 5
d) y= -3x+6 P (-3,4)
y₂= -3x+b
4= -3×(-3) + b
4= 9+b
b= 4-9 =-5
y₂= -3x -5
2.
x+2y=1 /×3
-3x+y=4
3x+6y=3
-3x+y=4
7y=7 /÷7
y=1
x=1-2×7 = 1-14= -13
x= -13 y=1