[tex]f(x) = ax + b \\ f(2) = a(2) + b = 7 \\ 2a + b = 7\\ \\ f( - 1) = a( - 1) + b = - 2 \\ - a + b = - 2\\ \\ eliminasi \\ 2a + b = \: \: \: \: 7 \\ - a + b = - 2 \\ ........................ - \\ 3a \: \: \: \: \: \: \: \: \: = \: \: \: 9 \\ a = \frac{9}{3} = 3 \\ \\ substitusi \\ - a + b = - 2 \\ - 3 + b = - 2 \\ b = - 2 + 3 \\ b = 1 \\ \\ rumus \: fungsi \\ f(x) = 3x + 1 \\ f(1) = 3(1) + 1 \\ f(1) = 3+ 1 \\ f(1) = 4 [/tex]
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[tex]f(x) = ax + b \\ f(2) = a(2) + b = 7 \\ 2a + b = 7\\ \\ f( - 1) = a( - 1) + b = - 2 \\ - a + b = - 2\\ \\ eliminasi \\ 2a + b = \: \: \: \: 7 \\ - a + b = - 2 \\ ........................ - \\ 3a \: \: \: \: \: \: \: \: \: = \: \: \: 9 \\ a = \frac{9}{3} = 3 \\ \\ substitusi \\ - a + b = - 2 \\ - 3 + b = - 2 \\ b = - 2 + 3 \\ b = 1 \\ \\ rumus \: fungsi \\ f(x) = 3x + 1 \\ f(1) = 3(1) + 1 \\ f(1) = 3+ 1 \\ f(1) = 4 [/tex]