Hi, can someone me with this?

solve the system of equations:
y= 2x-4
x= y+1

Cynthia takes her dog to the park every 2 days. she bathes her dog every 7 days. if she took her dog to the park and bathed him today, how long will it be until she does both on the same day again?

Given the conditional statement, match the following. conditional statement: if two lines intersect, then their intersection is one point.

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?