Which shows the result of a correct substitution for the system y=2x+3 and 3x+2y=9?

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way