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7,2
3,4
9,1
1,5
2. a) 2*3 - 3*(-1)= 9
9-3= 6
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2x -3y=6 +x - wynik
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sprawdzenie:
2*3 - 3*(-1)=6 + 3
9=9
b) 5*4 +3= 23 x=4 i y= 3
23-2=21
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5*4-21 +3=2 -wynik
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spr:
5*4-21 +3=2
20 - 21 +3=2