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use the matrix method to solve the pairs of simultaneous equations: 1).15s - 6t=4 6s...

use the matrix method to solve the pairs of simultaneous equations:
1).15s - 6t=4
6s 18t=5

2). 21x - 2y=15
13x - y=10

3).½u - ⅓v=4
⅓u - ½v=7?

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