Question

find the x and y such that sum of x and y is640 and difference between the number is80

Answer 1

The two equations formed are ;
X+y =640: - (eq 1)
X-y=80: - (eq 2)

Solving it simultaneously we get ;
2x=720;
X=360;

Putting x =360 in any of the equation we get ;
Y=280;
So x=360 & y = 280;

Hope it helped..

Answer 2

According to question :
x+y=640 ------eq(i)
x-y=80 ------eq(ii)

adding eq(i) and eq(ii) we get

x+y+x-y=640+80
2x=720
x=720/2
x=360

putting x=360 in eq(i) we get
x+y=640
360+y=640
y=640-360
y=280

x=360, y=280

hope this helps you.

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