peterigargan8126 peterigargan8126

07-02-2018
Mathematics

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Find the value of two numbers if their sum is 78 and their difference is 22.

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lucy145 lucy145

07-02-2018

x+y=78
x-y=22
Make x the subject
22+y=x
substitute in 1st equation
(22+y)+y=78
22+2y=78
y=28
place 28 in any equation
x-(28)=22
x=50
therefore one value is 28 and the other is 50
Hope this helps

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