Respuesta :

princessesther2011

Answer:

a = 10

Step-by-step explanation:

From the solution given, x = a and y = -1

Substitute for x and y in either of the equations

y = -x + 9

-1 = -a + 9

a = 9 + 1 = 10

Redeye170

Answer:

Answer is 10

Step-by-step explanation:

Since the graphe cross only at one point there is only one solution for the equation.

Can I get brianliest plz.

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