we have the system of equations

Solve by substitution
substitute equation 1 in equation 2

solve for x

Let
change of variable

substitute

Solve the quadratic equation
using the formula
a=5
b=-30
c=25
substitute


The values of u are
u=5 and u=1
Now solve for x
Remember that

Find out the values of y
For each value of x find out the value of y
Remember that

For x_1

The first solution is the point (1,5)
For x_2

The second solution is the point (-1,-5)
For x_3

For x_4
