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3x-15y=5-9y
7x-3y=8 |*(-2)
3x-6y=5
-14x+6y=-16
3x-6y=5
-11x=-11 |*(-11)
x=1
3x-3y+4x=8
3*1-3y+4*1=8
3-3y+4=8
-3y=-3-4+8
-3y=1 |:(-3)
y=-1/3
Licze na max pkt za zadanko z góry dzieki:D
3(x-5y)=5-9y
3x - 3y + 4x = 8
3x - 15y = 5 - 9y
7x - 3y = 8 mnożymy przez - 2
3x - 6y = 5
-14x + 6y = -16
3x - 6y = 5
- 14x + 3x = -16 + 5
-11x = -11
x = 1
3x - 6y = 5
3 - 6y = 5
- 6y = 5 - 3
- 6y =2
y = - 1/3
x = 1
y = - 1/3