<span>а)(3x-5)y, если x= -1,5 y= -0,9, то (3(-1,5)-5)(-0,9)=(-4,5-5)(-0,9)=-9,5*(-0,9)=1,4
</span><span>б)аx+4y, если= а=5, x= -2, y=10, то 5*(-2)+4(-2)=-10-8=-18</span>
Sin95π/7 = Sin(14π - 3π/7) = - Sin3π/7
5x+y=24 x4
7x+4y=18
20x+4y=96 _
7x+4y=18
13x=78 5x6+y=24
x=6 y=-6