Question

Y and x have a proportional relationship, and y = 12 when x = 5. What is the value of y when x = 8?

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Answer 1

y = kx <-- direct variation

Step 1: find k by plugging in given x and y and then solving.
12 = 5k
12/5 = k
2.4 = k
Step 2: plug in given x and k to find the missing y
y = 2.4 * 8
y = 19.2