3.3 Graphs

interpret information presented in a range of linear and non-linear graphs To include speed/time and distance/time graphs

understand and use conventions for rectangular Cartesian coordinates

plot points (x, y) in any of the four quadrants or locate points with given coordinates

determine the coordinates of points identified by geometrical information

Determine a line segment’s midpoint from the coordinates of its endpoints.

Draw and interpret straight-line conversion graphs, including currency-conversion graphs.

find the gradient of a straight line gradient = (increase in y) ÷ (increase in x)

recognise that equations of the form y = mx + c are straight line graphs with gradient m and intercept on the y-axis at the point (0, c) Write down the gradient and coordinates of the y intercept of y = 3x + 5; Write down the equation of the straight line with gradient 6 that passes through the point (0, 2)

Recognise, generate points and plot linear and quadratic function graphs, including tables and equations of the form ax + by = c.

recognise, plot and draw graphs of y = Ax³ + Bx² + Cx + D; y = Ax³ + Bx² + Cx + D + E/x + F/x² where at least three constants are zero; and y = sin x, y = cos x and y = tan x for angles of any size in degrees; x and y may be replaced by other variables

apply to the graph of y = f(x) the transformations y = f(x) + a, y = f(ax), y = f(x + a), y = af(x) for linear, quadratic, sine and cosine functions

interpret and analyse transformations of functions and write the functions algebraically

find the gradients of non-linear graphs By drawing a tangent

find intersections of a linear graph y₁ and a non-linear graph y₂, and recognise that their x-coordinates solve y₂ − y₁ = 0

Calculate a straight line’s gradient from the coordinates of two points.

Find equations of straight lines parallel or perpendicular to a given line.