Respuesta :
Answer:
K=54 and J=36
Step-by-step explanation:
If K+J=90 and J=18-K then we can solve it with a Linear System of Equations
K+J=90
-K+J=-18
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2J=72
J=36
Plug it back into the first equation: K+36=90 K=90-36 K=54
Notice the difference between K and J is still 18, since K - J =54-36=18.