Posted by Alex on Saturday, January 30, 2010 at 1:49pm.
7x+8y=25 times 5 is 35 x + 40 y = 125
9x+10y=35 times 4 is 36 x + 40 y = 140
++++++++++++++++++++++now subtract
-1 x + 0 = -15
so
x = 15
then
7(15) + 8 y = 25
105 + 8 y = 25
8 y = -80
y = -10
thanks but y\why did you multiply it by 4 and 5 at the begging
Because 40 is the least common multiple of 8 and 10
I could have used the first times 9 and the second times 7 and eliminated x.
What method is this (like is it elimination,substiution)
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