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erica [24]
3 years ago
11

Explain how you would estimate to subtract 189 from 643

Mathematics
2 answers:
xenn [34]3 years ago
8 0
You first round both numbers when estimating. the 189 would round to 200 and the 643 would round to 600. then you just simply subtract them both which is 400.
bulgar [2K]3 years ago
4 0
To estimate an answer to this problem, you must first estimate the numbers as well. 189 would round to 190, and 643 would round to 640. Now you would subtract 190 from 640, giving you 460. 
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Solve the following system by Elimination:
{7 x + 3 y = 22 | (equation 1)
{4 y = 20 | (equation 2)

Divide equation 2 by 4:
{7 x + 3 y = 22 | (equation 1)
{0 x+y = 5 | (equation 2)

Subtract 3 × (equation 2) from equation 1:
{7 x+0 y = 7 | (equation 1)
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Divide equation 1 by 7:
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{0 x+y = 5 | (equation 2)

Collect results:

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{4 x - y = -14 | (equation 2)

Swap equation 1 with equation 2:
{4 x - y = -14 | (equation 1)
{-(2 x) + y = 10 | (equation 2)

Add 1/2 × (equation 1) to equation 2:
{4 x - y = -14 | (equation 1)
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Multiply equation 2 by 2:
{4 x - y = -14 | (equation 1)
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Add equation 2 to equation 1:
{4 x+0 y = -8 | (equation 1)
{0 x+y = 6 | (equation 2)

Divide equation 1 by 4:
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Collect results:

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3 years ago
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77julia77 [94]

Answer:

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4 0
3 years ago
Read 2 more answers
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