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Bosnian 4 p + 3 q = 9
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2 p + 3 q = 3
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4 p - 2 p + 3 q - 3 q = 9 - 3
2 p = 6
Divide both sides by 2
p = 3
Put this value in equation:
4 p + 3 q = 9
4 ∙ 3 + 3 q = 9
12 + 3 q = 9
Subtract 12 to both sides
3 q = - 3
Divide both sides by 3
q = - 1