Angles a and c are supplementary. find the measure of angle c 7th grade horns math

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.

Witch represents the inverse of the function f(x)=1/4x-12

Solve x+3y=6 and 4x-6y=6 by elimination . show work !