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Question
Find the value of 2p − 3q + 4r − 8s, when p = 10, q = 8, r = 6, and s = 2
Sum
Solution
2p − 3q + 4r −8s
= 2 × 10 − 3 × 8 + 4 × 6 − 8 × 2
= 20 − 24 + 24 − 16
= 20 − 16
= 4
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Concept of Substitution
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