teddybekele178
teddybekele178 teddybekele178
  • 11-12-2021
  • Mathematics
contestada

if x+y=10 and x-y =6 what is the answer of x cube - y cube fast​

Respuesta :

maarawisimon98
maarawisimon98 maarawisimon98
  • 11-12-2021

Answer:

x+y=10 which means that x=10-y

Replace 10-y in the other equation which gives you:

10-y-y=6

10-2y=6

-2y=-4

y=2

Replace 2 in any of the 2 equations same answer for both:

x+y=10

x+2=10

x=8

So,

[tex] {x}^{3} - y^{3} [/tex]

[tex] = {8}^{3} - {2}^{3} [/tex]

=512-8

=504

Hope this helps!

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