<PRE><B>Question 600846</B>
ANSWER: your problem -----y=5x-7
                        -3x-2y=12
                       y=3,x=2


      THIS IS AN EXAMPLE TO HELP:---------x^2+y^2=25---equation 1
                                           y=x+1-------equation 2
                                     x^2+y^2=25----equation 1
                                  x^2+(x+1)^2=25---substitute x+1 for y
                                  2x^2+2x-24=0-------simplify
                                   2(x+4)(x-3)=0-------factor trinomial
x= -4,(or)x=3---zero product property
                              this is how to solve a linear quadratic system by substitution</PRE>