Each symbol has a value. The total sum of each row is shown alongside it.
We want to work out the value of each symbol.
What is the value of one triangle?
What is the value of one square?
What is the value of one circle?
What is the value of a triangle, a square and a circle?
That is, what number should replace the question mark?
Solve systems of two linear equations involving two variables, using the algebraic method of substitution or elimination