12. 3x - y+7/11 +2 = 10
2y + x+11/7=10
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Step-by-step explanation:
3x- (y-7)/11 +2 =10
multiply both sides by 11
33x -(y-7) + 22 = 110
33x-y+7+22=110
33x-y +29 = 110
33x-y = 81 --------------(1)
2y+(x+11)/7 = 10
multiply both sides by 7
14y +(x+11) = 70
14y +x + 11 = 70
x+14y = 59 ------------(2)
33x-y = 81 --------------(1)
x+14y = 59 ------------(2)
Multiply equation (1) by 14
462x-14y = 1134
x+14y = 59 --------(2)
add:26124/6482
463 x = 1193
x= 1193/463
substitute x=1193/463 into equation (2)
1193/463 + 14y = 59
multiply both sides by 463
1193 + 6482y = 27317
6482y = 26124
y = 26124 / 6482
divide the numerator and the denominator by 14
y = 1866/ 463
x= 1193/463
y = 1866/ 463
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