15-02-2017
Mathematics

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The difference between seven times one number and three times a second number is 25. The sum of twice the first and five times the second is 95.

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anthonysilby1 anthonysilby1

16-02-2017

7a - 3b = 25
2a + 5b = 95

35a - 15b = 125
6a + 15b = 285
41a = 410
a = 10

7(10) - 3b = 25
70 - 3b = 25
-3b = -45
b = 15

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