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T=x-8y
S+T= 6x-6y+x-8y=7x-14y
2S+3T= 12x-12y+3x-24y=15x-36y
4T-S= 4x-32y-6x+6y=-2x-26y
S = 6 *( x - y)
T = x - 8*y
b)
S + T = 6*( x - y) + x - 8*y = 6*x - 6*y +x - 8*y =
= 7*x - 14*y
-----------------
2 S + 3 T = 2*6*(x - y) + 3*[ x - 8*y] = 12*x - 12*y +3*x -24*y =
= 15 *x - 36*y
------------------------
4 T - S = 4*[x -8*y] - [6*( x - y)] = 4*x - 32*y - 6*x +6*y =
= - 2*x - 26*y
T- x-8y
b)S+T=6(x-y)+x-8y= 6x-6y+x-8y= 7x-14y
2S+3T=2(6(x-y))+3(x-8y)=12x-12y+3x-24y=15x-36y
4T-S= 4(x-8y)-6(x-y)= 4x-32y-6x+6y= (-2x)-26y