#1 is C. only II and III (7 and 9 will work when substituted in for x)
#2 is B. x<4 is the highest you can choose of the choices given (x<5 would be, but its not given)
#3 is B. x> -7.
-5x>35
x> 35/(-5)
x> -7
#4 is D. X<(or equal to) 1. notice how the dot is filled and not a hole.
hole = < or >
filled dot= <(or equal to) or >(or equal to)
#5 is B because you see that the number line translates as x<2.
the only equation choice given that fits is B.
#6 is B. X is somewhere in between the two numbers. not either way.
#7 is B. 6x+4< -20
6x< -20-4
6x< -24
x< -4
#8 is B. the same as the original.
#9 is B. www the filled holes. and the x is in between, not outside.
#10 not sure. between the two graphs they all lie within. if you gave me one graph i would know.
#14 i think its D. since there will be an x and a y solution. therefore 2.
#15 is A, (4,0). the x is 4, and there is not y.
#16 is B. (2,5)
x=12-2y
y= 5/2912-2y)
y=30-5y
6y=30
y=5
x=12-2y
x= 12-10
x= 2
#17 is C. 18 and 35. 18+35= 53. 18x2=36 36-1= 35 it checks off!
#18 is D, (3,2)
2x+3y=12
5x-3y=9
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7x=21
x=3
6=3y=12
3y=6
y=2
#19 the wording is strange, or i just can't see it well enough.