Question

the value of the expression (10y-20) depends on the value of y verify this by giving five different values to y and finding for each y the value of (10y - 20) . from the different values of (10y- 20) you obtain, do you see a solution to 10y -20 =50? if there is no solution, try giving more values to y and find whether the condition 10y-20=50 is met​

Answer 1

10y -20=50

10y =50+20

10y = 70

y = 70/10

y = 7

Answer 2

Answer:

               Let y = 2 . We have :  10y\ -\ 20\ =\ 10(2)\ -\ 20\ =\ 0

               Let y = 3 . We have :  10y\ -\ 20\ =\ 10(3)\ -\ 20\ =\ 10

               Let y = 4 . We have :  10y - 20 = 10(4) - 20 = 20

               Let y = 5 . We have : 10y - 20 = 10(5) - 20 = 30

               Let y = 6 . We have :  10y - 20 = 10(6) - 20 = 40

               Hence, 10y - 20 depends upon y

 

                Now, consider           10y - 20 = 50

                Transpose  - 20 to the RHS :  10y = 50 + 20 = 70

                                                                        or  

                                                                     y = 7