Question

Q.1. A) Choose the correct option.
i) If Dx = 20 and D= 5, then x =
A) 20 B) 135 C) 4 D) 15
ii) If x + y = 10 and x - y = 12. Then
A) x =11, y = 1 B) x =11, y = -1
C) x=-11, y = 1 D) x=-11, y=-1
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Answer 1

Answer:

1st solution-

Dx= 20

=> 5x=20

=> x= 4 (C)

hope it helps

Answer 2

Step-by-step explanation:

first answer is option c as 20 divided by 5 is 4 after substituting the values

Second answer is as following

x equals to 12 plus y so 12+y+y=10, so 12+2y=10, so y after solving will be -1, so correct option is B