SOLUTION: I need help with solving x + y = 51 x = # of cell phone model A4 y = # of smartphone Z20 then $35x + $50y = $2220 using substitution, elimination or matrices then graph

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Question 636810: I need help with solving x + y = 51
x = # of cell phone model A4
y = # of smartphone Z20
then $35x + $50y = $2220
using substitution, elimination or matrices
then graph
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

  x + y = 51      ||Multiply 1st by 35 and subtracting from 2nd EQ to eliminate x

35x + 50y = 2220

      15y = 435

        y = 29   and x = 22