y = − 2x + 5 x = 72
a) f(x) = − 2x + 5
1 72
−−−−−−−−−−−−−−−−−−−−I−−−−−−−−−−−−−−I−−−−−
f(x) = −2x + 5 3 − 3
f(1) = −2*1 + 5 = 3
f(72) = −2*72+5= −3