$T = a x + b$ ------------------------------- If $a \lt 0$: $T \lt 0$ for $x \gt \frac {-b} {a}$ $T \gt 0$ for $x \lt \frac {-b} {a}$ ------------------------------- If $a \gt 0$ :: $T \gt 0$ for $x \gt \frac {-b} {a}$ $T \lt 0$ for $x \lt \frac {-b} {a}$ ------------------------------- If $a = 0$ :: $T$ has the sign of $b$ -------------------------------

Got it !

## $T \lt 0$      When ??

 $T = -3x + 7$ $T = x - 3$ $T = 9x -6$

 Sign of $T = -2x+12$ for $x=6$ $T = 0$ $T = x-5\gt 0$ for $x\gt ?$ $-3x \gt 3$ for $x ?$ $0x -1 \gt 3$ for $x ?$ $-4 \leq 0x$ for $x ?$