PLEASE HELP ME ASAP Solve the system of equations below.
-3x+6y=9
5x+7y=-49
A. (-2,-7)
B. (-2,1/2)
C. (-7,-2)
D. (1,-2)
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Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Identify the number 127 as a rational or irrational. explain