3x +5y = 19
5x + 3y = 21
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multiplying 1st equation with 3 and 2nd equation with 5 and subtracting both we have
9x + 15y - 15x - 15y = 19 - 21
- 6x = - 2
x = 1/3
y = 18/5
9x + 15y - 15x - 15y = 19 - 21
- 6x = - 2
x = 1/3
y = 18/5
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