Part A
start by naming the variables you will be using in the system of equation
x= number of two-point baskets
y= number of three-point baskets
since she did 23 baskets the first equation representing the number of baskets she made will be
the second equation will be for the points, taking into account that x is 2 points and y is 3 points and she made 53 points.
Part B
Since the equations are not in the slope-intercept form they will be more complicated to graph, which using substitution it will be faster to find the solution of the system.
However both methods could be used.
Part C