exam Maths Puzzle Numerical Ability

I need some help on this problem please,

I need to solve the following systems by substitution:

8x - 4y = 16
y - 2x - 4

Thank you,
Lyn

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exam Other Question

What is the slope and graph for this problem?

y=px+d

where y is the total cost for the chairs
where p is the price per chairs
where x is the number of chairs
where d is t 5 cube root of 16 + cube root of 54