Use substitution to solve each system of equations.
y = –6x– 19
6 x – 5 y = –13

Like you said, we will use substitution to solve the system to get rid of y.

Next, we will use what we found for x and plug it into one of the original equations to solve for y. I will use the first equation.

Finally, we can now create the solution for this system.

the correct answer is d

hope this

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.