book Maths Puzzle Numerical Ability

21 X 2 - 54 / 9

The agruement is the order in which the expression is calculated.

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book Other Question

4x+y=14
x+5y=13 I dont understand ho to do this, please help me asap....
Complete the ordered pairs so that each is a given equation?
y=-2x+5 (0, ),( ,5),(3/2, ),( ,1)

I dont understand what