Round these numbers to the nearest 100 000: a) 6 870 628

b)18 333 206

c)704 387 454

please help

a) 6,900,000

b) 18,300,000

c) 704,400,000

21/58.

hope to be marked brainliest

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