Matthew wants to sell laptops and smartphones. He wants to sell at least 12 devices and earn at least $4500. L+S ≥ 12L represents the number of laptops L and smartphones S Matthew should sell to achieve his goal of selling at least 12 devices. 425L+125S ≥4500 represents the number of laptops and smartphones he can sell to earn at least $4500. Does Matthew meet both of his goals by selling 9 laptops and 6 smartphones?
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He sells 15 items so he meets the goal L + S >= 12
Checking the other inequality
425*9 + 125*6 = $4575 so he achieves the second goal as well.
Answer is Yes, he meets both of his goals!
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