HELP ME! i know this isn't math but people don't help me so i used this sudject anyways please & thank you <333

7) 40m = 40/1000 = 0.04km

8) 84m = 84/1000 = 0.84km

9) 63m = 63/1000 = 0.63km

10) 6.1cm = 6.1 × 10 = 61mm

11) 0.6cm = 0.6 × 10 = 6mm

12) 2.9cm = 2.9 × 10 = 29mm

13) 10m = 10 × 100 = 1000cm

14) 43m = 43 × 100 = 4300cm

15) 64m = 64 × 100 = 6400cm

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18