Unit 1
3 marks · EasyOn the same axes, plot the points C (2, 2) and D (2, 5). Consider the expression 2y + 1.
(a)[1 mark]
What is the vertical distance between points C and D?
(b)[1 mark]
If y = 3, evaluate the expression 2y + 1.
(c)[1 mark]
Write your answer to part (b) as a set containing one element.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) 3
(b) 7
(c) {7}
Show mark scheme and worked solution
Marking points
A1 (a) · 1 mark · Finds the difference in y-values: |5 - 2| = 3.
A2 (b) · 1 mark · Correct substitution: 2x3 + 1 = 7.
B1 (c) · 1 mark · Writes answer correctly in set notation.
Worked solution
a) The vertical distance is |5 - 2| = 3.
b) 2y + 1 = 2 × 3 + 1 = 7.
c) Write as {7}.