Khan academy circles unit test
1 answer:
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Answer:
x = - 6
Step-by-step explanation:
Given that y varies directly as x then the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition y = - 9 when x = 3, thus
k = =
= - 3
y = - 3x ← equation of variation
When y = 18, then
18 = - 3x ( divide both sides by - 3 )
x = - 6
In mathematics, 'is' would be the equal sign. And 'of' would be the multiplcation sign. The missing number would be any variable.
56 is 28% of a number would be translated algebraically to:
Solving for x, we get:
Divide 28 on both sides
Multiply 100 on both sides
56 is 28% of 200
56 is 28% of a number would be translated algebraically to:
Solving for x, we get:
Divide 28 on both sides
Multiply 100 on both sides
56 is 28% of 200