rex30889
rex30889 rex30889
  • 24-02-2017
  • Mathematics
contestada

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

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wolf1728
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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