Question

-- 1. 4x + 5 if x = -2
2. 2ab - 4 if a = 1 and b = -3
3. 5x + 3y if x = -2 and y = 1
4. 4x2 - 6x + 1 if x = 3 5mn2
5. if m = -2, n = 1 and p = 10 = p -
B. Perform the indicated operation.
6. 3x + 4x + (-2y)
7.(2x + 5y) + (4x - 8y)
8. – 2x - 3x + y -
9.(3x – 2y) – (5x + 3y)
10. 4x3.5x
11. -3x2, 2x -x3
12. (2x + 1)(3x - 2)
13. (5x --- 2)(5x + 2)
14. (x + 4)2
15.-36x? 4x2​


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Answer 1

Answer:

Correct option is B)

Let 5x+3y=3c,       ...(1)

2y=c−4x,         ...(2)

and x+y=6             ...(3)

Adding equations (2) and (3), we get.

3y=c−5x+6     ...(4)

Substituting this equation (4) in equation (1), we get

5x+(c−5x+6)=3c

⇒5x+c−5x+6=3c

⇒c+6=3c

⇒6=2c

⇒c=

Step-by-step explanation:

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