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solve for y then find the value of y for the given value of x

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3 Answers

3x+y=27, when x=7
 
1. Replace any x in the equation with 7.
 
3(7) + y=27
 
2. Simplify.
 
21+y=27
 
3. Solve for y.
 
y=27-21
y=6
 
4. Check your answer by inserting x=7 and y=6 into the original equation.
 
3(7) +6=27
21+6=27
27=27
Yes, it checks.
 
To solve the first equation for y, isolate y.
 
3x + y = 26
Subtract 3x from both sides of the equation.
This leaves:
 
y = 26 - 3x
 
Now find the value of y for the corresponding value of x.
 
y = 26 - 3 (7) = 26 - 21 = 5
 
 
 Just use the method of substitution . Substitute X =7 in the first equation and solve for y.