Tolong dibantu yaa:) terimakasih:)

23. f(x) = -2x+3

a. baynagan darix = -1
f(x) = -2x+3
f(-1) = -2.-1 + 3
= 2+3
= 5

b. f(x) = -2x + 3
1 = -2x +3
1-3 = -2 x
-2 = -2 x
x = -2/-2
x = 1