Solving system using substitution 5x-y=5 -x+3y=13

(2,5)

Step-by-step explanation:

5x-y=5

-5 -5

y=-5+5x

-x+3y=13

-x+3(-5+5x)=13

solve

x=2

substitute the value of x into an equation

-5+5×2

multiply 5 and 2

-5+10

y=5

answer for #1 is c

answer for #2 is d

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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.