3 years ago

1)

1 answer:

algol133 years ago

3 0

You will try all the cases and see if all the equations will match after substituting or no.
1.
5x
put x = 1/2
2.5 isn't equal to 20

4=15x
put x =1/2
15 × 1/3 =7.5
7.5 isn't equal to 4

-4x = 60
put x = 1/2
-4×1/2 = -2
-2 isn't equal to 60

30 = 60x
pit x = 1/2
60 × 1/2 = 30
30 = 30

Therefore, the correct answer is D. 30 = 60x

2. Answer is B. -4 , 4

Put x = -4
l 5 × -4 l = l-20l = 20
20 = 20

Put x = 4
l 5 × 4 l = l20l = 20
20 = 20

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