
Concept explainers
To solve: the given equation for y . Check the result.

Answer to Problem 70STP
The value of y in the given equation is y=5 or y=−353 .
Explanation of Solution
Given information:
Given equation
|3y+10|=25
Concept used:
Absolute value of a function a is given by
|a|={a a>0−a a<00 a=0
And
|−a|=a|a|=a
More over
|x+a|=b⇒x+a=b or x+a=−b
Calculation:
Consider the given equation,
|3y+10|=25
Now, solve the equation as shown,
|3y+10|=253y+10=25 or 3y+10=−253y+10−10=25−10 or 3y+10−10=−25−103y=15 or 3y=−35y=153 or y=−353y=5 or y=−353
Now, check the result by back substitution.
|3(5)+10|=25|15+10|=25|25|=2525=25
And
|3(−353)+10|=25|−35+10|=25|−25|=2525=25
Which is true.
Hence, the value of y in the given equation is y=5 or y=−353 .
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