diketahui f(x) = ax + b. jika f(2) = 3 dan f(-3) =13,nilai dari -a+b adalah

[tex]f(x) = ax + b \\ f(2) = 3 \\ \\ ax + b \\a \times 2 + b = 3 \\ 2a + b = 3 \\ \\ .\\ \\ f(x) = ax + b \\ f( - 3) = 13 \\ \\ax + b \\ a \times - 3 + b = 13 \\ - 3a + b = 13 \\ \\ . \\ \\ 2a \: \: \: + b = 3 \\ - 3a + b = 13[/tex]
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[tex]5a = - 10 \\ a = - 2 \\ \\ 2a + b = 3 \\ 2 \times - 2 + b = 3 \\ - 4 + b = 3 \\ b = 3 + 4 \\ b = 7[/tex]

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[tex] - a + b \\ = - ( - 2) + 7 \\ = 2 + 7 \\ = 9[/tex]