Question

Va rog repedeeeee....plssssssss

Answer 1

Aceeasi culegere ~~Sper ca te-am ajutat!~~

Answer 2

b. x/4=y/9

x=4k

y=9k

5x-y=88

5×4k-9k=88

20k-9k=88

11k=88

k=88:11

k=8

x=4×8

x=32

y=9×8

y=72

c. x/2=y/3=z/4

x=2k

y=3k

z=4k

x+y+z=18

2k+3k+4k=18

9k=18

k=18:9

k=2

x=2×2

x=4

y=3×2

y=6

z=4×2

z=8

d. x/3=y/4=z/5

x=3k

y=4k

z=5k

x+2y+3z=104

3k+2×4k+3×5k=104

3k+8k+15k=104

26k=104

k=104:26

k=4

x=3×4

x=12

y=4×4

y=16

z=5×4

z=20

10. (x+1)/5=(x+4)/13

13(x+1)=5(x+4)

13x+13=5x+20

13x-5x=20-13

8x=7

x=7/8