Person A buys 10 granola bars and 6 cups of yogurt for $18
Person B buys 5 granola bars and 4 cups of yogurt for $9.50
Let x represent the granola bars
Let y represent the yogurt
10x + 6y = 18 << ( Divide both sides by 2 )
The second equation is 5x + 4y = 9.50. Now subtract the two equations.
5x + 4y = 9.50
-5x - 3y = -9
y = $.50
5x + 3(.50) = 9
5x + 1.50 = 9
5x = 7.5
x = $1.50
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