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2a + b = 5
-2a + b = 7
4a = -2
a = -½
-2a + b = 7
-2.-½ + b = 7
1+ b = 7
b = 6
fungsinya yaitu
f(x)=-½x + 6
f(x)=ax+b
subtitusikan nilai x kemudian eliminasi kan
f(2)=2a+b=5
f(-2)=-2a+b=7
----------------------- -
4a=-2
a=-2/4
a=-½
subtitusikan nilai a ke salah satu persamaan
2a+b=5
2(-½)+b=5
b=5+1
b=6
subtitusikan a dan b ke rumus dasar
f(x)=ax+b
f(x)=-½x+6 -->Rumus fungsi