If y = 5 when x = -3, find x when y = -12 I've spent the past few minutes figuring it out, but I can't figure out what to do because 5 doesn't go into 3.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870