4x + 4 = 4y
y = 2x
Algebra House 

A fashion designer makes and sells hats. The material for each hat costs $5.50. The hats sell for $12.50 each. The designer spends $1400 on advertising. How many hats must the designer sell to break even?
How do you solve this system of equations using the substitution method?
3x  4y = 10 y = x  3 
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