Penyelesaian dari 2x-5y=31 7x+3y=6 adalah? x=a dan y=b,nilai (a-b)²=...... Tolong dijwb+kasih caranya kak..

2x - 5y = 31 ( x7 )
7x + 3y = 6 ( x2 )

14x - 35y = 217
14x + 6y = 12
___________ -
29y = 205
y = 205/29

2x - 5y = 31
2x - 1.189 = 31
2x = 31 + 1.189
2x = 1.220
x = 610

a = 610
b = 205/29

( a - b ) ^2
= ( 610 - 205/29 ) ^2
= 17.690/29 - 205/29 ^2
= 17.485/29 ^2
= 602,93^2
= 36.524,58