Dla jakich wartości a, b, c punkty A= (-3, a ) , B=( 2b,½) i C= (c-2, -3c ) leżą na prostej y=-2,5x+2
y=-2,5x+2
A= (-3, a ) ,
a = -2,5 * (-3) +2
a = 7,5 + 2
a = 9,5
B=( 2b,½)
1/2 = -2,5 * 2b +2
1/2 = -5b + 2
5b = 2 - 1/2
5b = 1,5 /:5
b = 0,3
C= (c-2, -3c )
-3c = -2,5 *(c-2) +2
-3c = -2,5c + 5 +2
-3c +2,5c =7
-0,5c =7
c =-14
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y=-2,5x+2
A= (-3, a ) ,
a = -2,5 * (-3) +2
a = 7,5 + 2
a = 9,5
B=( 2b,½)
1/2 = -2,5 * 2b +2
1/2 = -5b + 2
5b = 2 - 1/2
5b = 1,5 /:5
b = 0,3
C= (c-2, -3c )
-3c = -2,5 *(c-2) +2
-3c = -2,5c + 5 +2
-3c +2,5c =7
-0,5c =7
c =-14