Please someone help me out I don't understand ;-;

Solve 2x+y=3 x+y=5 in substitution method

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.

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.