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abcdancer
Find the value of two numbers if their sum is 12 and their diffference is 4.
Set up two equations and solve. x+y=12 x-y=4 Solve for y in one: y=12-x Plug that into the other equation: x-(12-x)=4 x-12+x=4 2x-12=4 2x=16 x=8 Then plug x into one of the equations you solved for y: y=12-8 y=4 Soooooo, the two numbers are 8 and 4.