3 years ago

The sum of two numbers is 13 and there difference is 5 what are the 2 numbers?

2 answers:

8 0

X+y=13
x-y=5
we can addd these 2 equations to eliminate y

2x+0y=18
2x=18
divide both sides by 2
x=9

sub back
x+y=13
9+y=13
minus 9 both sides
y=4

the 2 numbers are 9 and 4

Zielflug [23.3K]3 years ago

4 0

X + y = 13
x - y = 5

x = (13 - y)

(13-y) - y = 5

13 - 2y = 5
-2y = -8
y = 4

x - 4 = 5
x = 9

x=9, y = 4

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