Y=5x +4, y= -3x-12 solve each system using the substitution method. when asked, solve the system by graphing in addition to using the substitution method.

5x+4=-3x-12
2x=-16
x=-8

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*