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Mariulka [41]
3 years ago
5

Given that r = 7x+7y find x when y = 2 and r = 8

Mathematics
1 answer:
larisa [96]3 years ago
8 0

Answer:

x = -6/7

Step-by-step explanation:

We must substitute in the values and solve for x

r = 7x + 7y\\(8) = 7x + 7(2)\\8 = 7x + 14\\8 - 14 = 7x + 14 - 14\\-6 = 7x\\-6/7 = 7x/7\\x = -6/7

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