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-5t+t-6-7t+8t+2+2t=5t-4
t=-3,2
5×(-3,2)-4=-20
b)
-7x+6y+3x-2y+x-3y=-3x+y
x=-⅔
y=⁴/₇
-3×-⅔+⁴/₇=2⁴/₇
-5t+t-6-7t+8t+2+2t=-8t-4=-8*(-3,2)-4=21,6
b) -7x+6y+3x-2y+x-3y dla x= -⅔ i y= 4/7
-7x+6y+3x-2y+x-3y =-3x+y=-3*(-2/3)+4/7=2+ 4/7=2 4/7
-5t+t-6-7t+8t+2+2t= -t-4
t= -3,2
-t= 3,2
3,2-4= -0,8
b)
-7x+6y+3x-2y+x-3y= -3x+ y
x= -2/3
y=4/7
-3* 2/3+4/7= 2i 4/7