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7= -1x+b....(1)
1= 2x +b.....(2)
nah mereka dicari pake substitusi
-2 =x Dan b= 5 maka rumus fungsi f(x) = -2+ 5=3
f(-1)= -1a+b=7
f(2) = 2a+b =1
--------------- -
-3a = 6
a = -2
b =...?
-1a+b=7
-1(-2)+b=7
2+b=7
b=7-2= 5
Rumus fungsi
f(x) = ax + b
f(x) = 2x + 5
semoga membantu^^