Solve this the same way I showed you earlier.
http://www.jiskha.com/display.cgi?id=1341690934
Solve by setting up the proper equation to describe the facts given and then carrying out the mathematical calculations to solve for the unknown variable(s).
The sum of two numbers is 36. Their difference is 4. Determine the two unknown numbers.
2 answers
First case:
x+y =36... equation (i )
Second case:
x-y =4 ......equation (ii)
Solving equation i and ii by eliminating method we get,
x+y = 36
x-y =4
2x =40
x = 40รท2
.: x = 20
Now, putting the value of x in equation i we get,
20 + y = 36
y = 36-20
.: y=16
x+y =36... equation (i )
Second case:
x-y =4 ......equation (ii)
Solving equation i and ii by eliminating method we get,
x+y = 36
x-y =4
2x =40
x = 40รท2
.: x = 20
Now, putting the value of x in equation i we get,
20 + y = 36
y = 36-20
.: y=16
2 answers