Question

a) x+1 si 3 sunt direct proportionale cu x-1 si 2

b) x+2 si 5 sunt invers proportionale cu 4 si x-1
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Answer 1

a)x+1,3 d.p. x-1,2

x+1/x-1=3/2

2(x+1)=3(x-1)

2x+2=3x-1

-3x+2x=-3

-x=-3=>x=3

b) x+2,5 i.p. 4,x-1

4(x+2)=5(x-1)

4x+8=5x-5

4x-5x=-13

-x=-13=>x=13