更新1:
What goes in the two blanks?
2x + 3y = -17 is one equation in a coincidental system of two linear equations.The other equation is __ y=__ x-102?
回答 (1)
2017-01-22 2:52 am
2x + 3y = -17
y = x - 102
Rearrange
2x + 3y = -17
-x + y = -102
Eliminate 'x' by multiplying the bottom eq'n by '2' and then adding.
2x + 3y = -17
-2x + 2y = - 204
Add
5y = - 221
y = -221/5
Substitute back in for 'x'
-x + y = -102
-x - 221/5 = -102
x = 102 - 221/5
x = (510 - 221) / 5
x = 289/5
y = x - 102
Rearrange
2x + 3y = -17
-x + y = -102
Eliminate 'x' by multiplying the bottom eq'n by '2' and then adding.
2x + 3y = -17
-2x + 2y = - 204
Add
5y = - 221
y = -221/5
Substitute back in for 'x'
-x + y = -102
-x - 221/5 = -102
x = 102 - 221/5
x = (510 - 221) / 5
x = 289/5
收錄日期: 2021-04-24 00:19:36
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