Lets reorder the equations
y = x - 1 (1)
y = x +1 (2)
Since both lines have the same slope (m = 1), then this is an inconsistent system with NO solution
let the number = x
x*80/100 = 55
x = 5500/80
x=68.75
After rounding off, it will remain 68.75
The answer is A-7 and it’s matrix 18 times 65
H^2=x^2+y^2
35^2=29^2+y^2
y^2=35^2-29^2
y^2=384
y=√384
y≈19.60 m (to the nearest hundredth of a meter, or nearest centimeter)