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Sagot :
sum means add
difference menad subtract
2 ways to solve,
1, eliminate
x+y=12
x-y=4
so
we can add the 2 equations
x+x+y-y=12+4
2x=16
divide 8
x=8
subsitute
8+y=12
subtract 8
y=4
the other ways is subsiute
x+y=12
x-y=4
x-y=4
add y to both sides
x=4+y
subsitute 4+y for x
4+y+y=12
subtract 4
2y=8
divide 2
y=4
subsitute
x+4=12
subtract 4
x=8
the numbers are 8 and 4
difference menad subtract
2 ways to solve,
1, eliminate
x+y=12
x-y=4
so
we can add the 2 equations
x+x+y-y=12+4
2x=16
divide 8
x=8
subsitute
8+y=12
subtract 8
y=4
the other ways is subsiute
x+y=12
x-y=4
x-y=4
add y to both sides
x=4+y
subsitute 4+y for x
4+y+y=12
subtract 4
2y=8
divide 2
y=4
subsitute
x+4=12
subtract 4
x=8
the numbers are 8 and 4
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