Y=kx+b
{-5=k*4+b
{19=k*(-2)+b
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24k=-6k
k=-4
-5=-4*4+b
b=-5+16=11
ответ y=-4x+11
На графике
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<span>5 (х+1) - 2 (3х-2) > 3х
5х + 5 - 6х + 4 </span>> 3х
5х - 6х - 3х > - 9
-4х > -9
х ∠
х ∠ 2,25
2. t²-9t=v ⇒
v²+22v+112=0 D=36
v₁=-14 v=-8
t²-9t=-14 t²-9t+14=0 D=25 t₁=2 t₂=7
t₂-9t=-8 t₂-9t+8=0 D=49 t₃=1 t₄=8
4. 2x²+3=v
v²-12v+11=0 D=100
v₁=11 v₂=1
2x²+3=11 x²=4 x₁=2 x₂=-2
2x²+3=1 x²=-1 x∉
6. (x²+3x+1)(x²+3x+3)=-1
x2+3x+1=v
v(v+2)=-1
v²+2v+1=0
(v+1)²=0
v=-1
x²+3x+1=-1
x²+3x+2=0 D=1
x₁=-1 x₂=-2.