a) a = 4x = 4 * {6;3} = {24;12}
b) b = -y = -1 * {-2;1} = {2;-1}
c) c = x - y = {6;3} - {-2;1} = {6 + 2;3 - 1} = {8;2}
d) d = 2x + 4y = 2 {6;3} + 4 {-2;1} = {12;6} + {-8;4} = {12 - 8;6 + 4} = {4;10}
a) a = 4x = 4 * {6;3} = {24;12}
b) b = -y = -1 * {-2;1} = {2;-1}
c) c = x - y = {6;3} - {-2;1} = {6 + 2;3 - 1} = {8;2}
d) d = 2x + 4y = 2 {6;3} + 4 {-2;1} = {12;6} + {-8;4} = {12 - 8;6 + 4} = {4;10}