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a)
y = 0
0 = 2x+8
2x = -8
x = -4
(-4,0)
x = 0
y = 0+8
y = 8
(0,8)
========================
b)
y = 0
0 = -3x+9
-9 = -3x
x = 3
(3,0)
x = 0
y = 0+9
y = 9
(0,9)
=============================
c)
y = 0
0 = x/2-6
x/2 = 6
x = 12
(12,0)
x =0
y = 0-6
y = -6
(0,-6)
==============
d)
y = 0
0 = 3x^2 - 27
37 = 3x^2
9 = x^2
x = 3
(3,0)
x=0
y = -27
(0,-27)