b)
∫ (x-y)² + 2xy = (x+1)² + (y-3)²
∫ 2x + y= 4
a)
∫3 (x-1) = 4y + 1
∫ 5 (y-1) = x + 1
3x-3=4y+1
5y-5=x+1
3x-4y=1+3
5y-x=1+5 / *3
3x-4y=4
15y-3x=18
______________
3x-4y+15y-3x= 4+18
-4y+15y=22
11y=22/:11
y=2
3x-4*2=4
3x-8=4
3x=4+8
3x=12/:3
x=4
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a)
3x-3=4y+1
5y-5=x+1
3x-4y=1+3
5y-x=1+5 / *3
3x-4y=4
15y-3x=18
______________
3x-4y+15y-3x= 4+18
-4y+15y=22
11y=22/:11
y=2
3x-4y=4
3x-4*2=4
3x-8=4
3x=4+8
3x=12/:3
x=4