\[y_{1} = 2a + 3;\ \ y_{2} = 3a + 7:\]
\[y_{1}( - 4) = 2 \cdot ( - 4) + 3 =\]
\[= - 8 + 3 = - 5;\]
\[y_{2}( - 4) = 3 \cdot ( - 4) + 7 =\]
\[= - 12 + 7 = - 5;\]
\[y_{1}(10) = 2 \cdot 10 + 3 = 20 + 3 = 23;\]
\[y_{2}(10) = 3 \cdot 10 + 7 = 30 + 7 = 37;\]
\[y_{1}(10) \neq y_{2}(10).\]