Hello, I need to know how to solve the system of linear equations by substitution. these are the two equations:
3x+y=-9
y=5x+7
for x I got -2 but im not sure if its correct.
thanks for the help!

I'm sure it's correct:)

Step-by-step explanation:

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step-by-step explanation:

which of the following statements correctly describes the expression below based on its degree and number of terms?

314 - 7x2 + 11