Вроде так, дальше тут не сократишь!
.a) <span><span>(`-∞,2);(4,+∞<span>) x -4 -3 -2 -1 0 1 2 3 4
y 9/7 9/6 9/5 9/4 3 9/2 9/1 \\\ -9
b) </span></span></span><span><span>(-3,-∞);(6,∞);(0,4);(6,+∞<span>)
x -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
y 2.9 3.4 4.4 6.8 16 /// 0 -1.2 -0.9 -0.6 -0.3 -0.1 0 0.1 0.2
</span></span></span>
Cosa = 1-sin²a=√(1-144/169)=5/13
ctga = cosa/sina=-5/12
Х - 2у - 3х + 5у = (х - 3х) + (5у - 2у) = - 2х + 3у = 3у - 2х
8,7 - 2m + n - 1/3m + 2/3n = 8,7 - (2m + 1/3m) + (n + 2/3n) = 8,7 - 2 1/3m + 1 2/3n
В приложении ............