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)   (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
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