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alisha [4.7K]
3 years ago
14

If 5x+4y=58 and 3x + 7y = 67 find the value of ( x + y ) ​

Biology
1 answer:
Marrrta [24]3 years ago
8 0

Explanation:

5x + 4y = 58 ....1

3x + 7y = 67 ....2

....1 × 3 both sides of the equation

15x + 12y = 174 ....3

....2 × 5 both sides of the equation

15x + 35y = 335 ....4

.....4 - ......3 both sides of the equation

35y - 12y = 335 - 174

23y = 161

y = 161/23

= 7

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