Question

y=4×+6

f (x)=-×+10

f (x)=-2×+5

Answer 1

Y= 4x + 6 
0 = 4x + 6
- 6 = 4x
4x = - 6
x = - 6 (:2)
      ------
         4  (:2)

x = - 3
       -----
         2

*************************
f (x) = - x + 10
0 = - x + 10
x = 10

******************************
f (x) = - 2x + 5
0 = - 2x +5
2x = 5
x = 5/2