Concept explainers
To Calculate:
If y = 6 when x = 18, find y when x = -12.
Answer to Problem 78SR
y = -4 , when x = -12
Explanation of Solution
Given Information:
If y = 6 when x = 18 .
Concept Used:
Direct proportion or direct variation is the relation between two quantities where the ratio of the two is equal to a constant value. It is represented by the proportional symbol ,
For example, x and y are two quantities or variables which are linked with each other directly, then we can say
Calculation:
Since y varies directly as x .
So, the direct variation equation is
Substitute x =-12 and find y :
So, y = -4 when x = -12.
Chapter 4 Solutions
Algebra 1
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