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- a + b = 5
_________ -
3a = - 12
a = - 4
b = 1
h(x) = - 4x + 1
f(2)= -7 >> 2a+b= -7
f(-1)= 5 >> -a+b = 5
dicari pake persamaan:
(2a+b= -7) - (-a+b=5)
>> 3a = -12, maka a= -4
a udah ketemu, skrng nyari b
-a+b= 5,
-(-4)+b= 5
4+b= 5, b= 1
maka rumus fungsi h(x) = ax+b = -4x+1