Detailed explanation please.
Notice -u=-2 and 9u=18 have the same solution, which is u=2, and so v=0
5v − u = −2
−5v + 45u = 90
---------------------
44u = 88
u = 2
45v − 9u = −18
−v + 9u = 18
44v = 0
v = 0
You could use elimination; multiply row 2 by 5 to make it
-5v + 45u = 90 then add the second row to it to eliminate v
+5v - u = -2
--------------------
44u = 88 so u = 88 ÷ 44 = 2
then plug that in to either equation to get v (I''ll use the second):
-v + 9•2 = 18
-v + 18 = 18
-v = 0 so v = 0
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Answers & Comments
Notice -u=-2 and 9u=18 have the same solution, which is u=2, and so v=0
5v − u = −2
−5v + 45u = 90
---------------------
44u = 88
u = 2
45v − 9u = −18
−v + 9u = 18
---------------------
44v = 0
v = 0
You could use elimination; multiply row 2 by 5 to make it
-5v + 45u = 90 then add the second row to it to eliminate v
+5v - u = -2
--------------------
44u = 88 so u = 88 ÷ 44 = 2
then plug that in to either equation to get v (I''ll use the second):
-v + 9•2 = 18
-v + 18 = 18
-v = 0 so v = 0