7 is not because a couple x values were repeated
8 is not because the x value -2 was used for two y values
9 is not because a couple x values were used for more than one y value
10 is a function is x alue is only used once
hope this helps :)
Answer:
Step-by-step explanation:
The change is -(1/2 + 3/4 + 3/8).
If you add the fractions, you get -(13/8).
W= width
L= length= 2W-4
Perimeter= 70
FIND WIDTH:
P= 2(L + W)
P= 2L + 2W
substitute 2W-4 for L
70= 2(2W-4) + 2W
multiply 2 by all in parentheses
70= (2*2W) + (2*-4) + 2W
70= 4W - 8 + 2W
combine like terms
70= 6W - 8
add 8 to both sides
78= 6W
divide both sides by 6
13= W
FIND LENGTH:
substitute w=13 to find width
L= 2W-4
L= 2(13)-4
L= 26-4
L= 22
CHECK:
P= 2(L + W)
70= 2(22 + 13)
70= (2*22) + 2(13)
70= 44 + 26
70= 70
ANSWER:
length= 22 inches
width= 13 inches
Hope this helps! :)
Answer:
x=2i, -2i
Step-by-step explanation:
