Verified answer

[tex]y = 7 - 3x[/tex]

[tex]7 - 3x = 7 \\ - 3x = 7 - 7 \\ - 3x = 0 \\ x = 0[/tex]

[tex] \\ \\ [/tex]

[tex]f(x) = {2x}^{2} + x[/tex]

[tex]1) \: \: \: \: \: f(2) = 2 \times {2}^{2} + 2 = 2 \times 4 + 2 = 8 + 2 = 10[/tex]

[tex]2) \: \: \: \: \: f( - 1) = 2 \times {( - 1)}^{2} + ( - 1) = 2 \times 1 - 1 = 2 - 1 = 1[/tex]

[tex]3) \: \: \: \: \: f(0) = 2 \times {0}^{2} + 0 = 2 \times 0 + 0 =0[/tex]