Work backwards — Grade 7 Math, what it means and where it is taught
Start from the result and undo each step.
Taught in Grade 7 Math.
Where it is taught
Practise this idea
2 questions in the course bank use Work backwards, in Distance on the Coordinate Plane, Coordinate Geometry Proofs.
Problem 1
The midpoint of AB is (4, 5) and A is (1, 2). Find B.
Worked answer
(7, 8)
1 + x2 = 4, so x = 7
2 + y2 = 5, so y = 8
Problem 2
The midpoint of AB is (4,5) and A is (1,2). Find B.
Worked answer
(7, 8)
1+x2 = 4, so x = 7
2+y2 = 5, so y = 8