find two numbers with a sum of 15 and a difference of 4
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let the first no.be x
and,the second no.be y
then,x+y=15(1)
x-y=4(2)
use the elimination methods(subtract 1 from2)
x+y=15
x-y=4
- +=-
2y=11
y=11÷2
=5.5
x+y=15
x+5.5=15
x=15-5.5
x=9.5
and,the second no.be y
then,x+y=15(1)
x-y=4(2)
use the elimination methods(subtract 1 from2)
x+y=15
x-y=4
- +=-
2y=11
y=11÷2
=5.5
x+y=15
x+5.5=15
x=15-5.5
x=9.5
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