rex30889 rex30889

24-02-2017
Mathematics

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solve the system by substitution 0.5x + 0.25y = 36 y+18=16x

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wolf1728 wolf1728

01-03-2017

A) 0.5x + 0.25y = 36
B) y+18=16x
Rearranging equation B
B) -16x + y = -18
Solving equation A for "y"
A) y = 144 -2x then we insert this into B)

B) -16x +144 -2x = -18
-18x = -162
x = 9

B) y+18=16*9
y = 126

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