The relationship between two variables is linear if, when plotted on a pair of axes, a straight line is formed.

Graphically solving two linear graphs that intersect

Maths

In this unit, pupils studied the graphical representation of a geometric sequence and linked features of the graph to its equation. In the future unit, other types of graphs are introduced and their key features identified.

In the prior unit, pupils considered geometric sequences and how they might be represented graphically. In this unit, pupils study the graphical representation to link features of the graph to its equation.

Graphical representations

The point where the lines $$y=2x+4$$ and $$y=2-x$$ meet is called the {{ }}.

Izzy plots the graphs of $$y=2x+1$$ and $$y=3x-2$$ on the same coordinate grid. How many points will lie on both lines?

The linear equations $$y = 2x + 5$$ and $$y = 2 − x$$ intersect at the point with coordinates (−1, 3). What is the solution to the equation $$2x+5=2-x$$?

Use the graph to solve the simultaneous equations $$y=2x-1$$ and $$y=3x-2$$.

The diagram shows 6 points and the the lines $$y=2x-1$$ and $$y=5-x$$. Which points satisfy the inequality $$y>2x-1$$ ?

The diagram shows 6 points and the the lines $$y=2x-1$$ and $$y=5-x$$. The point that is the region $$y>5-x$$ and $$y<2x-1$$ is {{}}.

The graph of a __________ equation is a straight line.

Which of these lines has the least steep gradient? 

Use the graph of $$y =3x-4$$ to solve the equation $$3x-4=2$$. The solution is $$x=$${{}}.

Use the graph of $$y =7.4 x+12.95$$ to estimate the value of $$7.4\times 4+12.95$$. 

Aisha is plotting the graph of the line $$3y + 4x=24$$. She only wants to plot two points. Which of these points would be the best points for Aisha to use?

Select the points which lie both on the line $$y=2x+1$$ and on the line $$y=3x-2$$.

This lesson will soon be taken down.

Graphically solving two linear graphs that intersect

Lesson outcome