Need help i dont understand 2-9x5/7

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Need an artist designed a badge for a school club. figure abcd on the coordinate grid below shows the shape of the badge: the badge is enlarged and plotted on the coordinate grid as figure jklm with point j located at (2, -2) and point m is located at (5, 4). which of these could be the coordinates for point l? a. (2, 4) b. (8, 4) c. (5, 1) d. (5, 7)

Through non-collinear points there is exactly one plane.