In which step did emesto make the first error?
emesto tried to determine the solution for the system of
equations using substitution. his work is shown below.
x-y=7
3x - 2y = 8
step 1: x = y + 7
step 2: 3(y + 7) - 2y = 8
step 3: 3y + 7 - 2y = 8
step 4: y + 7 = 8
step 5: y = 1
step 1
step 2
step 3
step 4

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step-by-step explanation:

what are ur choices?

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.