4y=8, 4x-7y=-5; y=2, 4x-7*2=-5; y=2, 4x=9; y=2, x= 2.5
Y=9-x² y=x+3 S-?
9-x²=x+3
x²+x-6=0 D=25
x₁=-3 x=2
S=₋₃∫²((9-x²)-(x+3))dx=₋₃∫²(6-x-x²)dx=(6x-x²/2-x³/3) ₋₃|²=
=6*2-2²/2-2³/3-(6*(-3)-(-3)²/2-(-3)³/3)=12-2-8/3+18+4,5-9=
=23¹/₂-8/3=47/2-8/3=(47*3-8*2)/6=(141-16)/6=125/6=20⁵/₆.
Ответ: S≈20,83 кв. ед.
(2x-1)/3=(x+5)/8-(4-4x)/8
(2x-1)/3=(x+5-4+4x)/8
(2x-1)/3=(5x+1)/8
(16x-8)/24=(15x+3)/24
16x-8=15x+3
16x-15x=3+8
x=11