I need help with #53 to #60 ASAP … please help this I don’t understand this …. It is due today … can someone please help me with it And show step by step please

Consider a graph for the equation y= -3x+4. what is the y intercept? a) 4 b) -4 c) 3 d) -3

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

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?