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Emily manages a health bar and charges $2 for a banana smoothie and $2. 50 for a strawberry smoothie.
She sold 40 in all and earned $87. How many banana smoothies and strawberry smoothies did she sell?
Solving System of Linear Equations by Substitution

Respuesta :

26 banana and 14 strawberry

2xB + 2.5xS = 87
B+S=40

Then B=40-S replace B in first equation
2x(40-S)+2.5xS=87
80-2xS+2.5xS=87
-2xS+2.5xS=7
0.5xS=7
S=14
40-14=26=B

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