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WAEC Mathematics 2022 Paper

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Question : 13

Total: 47

If 5x + 3y=4 and 5x-3y= 2, what is the value of (25x‌2 -9y‌2)?

20
16
2
8

Solution:

5x + 3y=4

5x-3y= 2

Using elimination method

5x + 3y=4 → 5x + 3y=4

-[5x-3y= 2] → -5x +3y= -2

6y = 2

y → 1/3 and x = 3/5

solving (25x‌2 -9y‌2)

25 * [3/5]‌2 -9 * [1/3]‌2

25 * ‌

9

25

- 9 ‌

1

9

9 - 1 = 8

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