exam Maths Puzzle Numerical Ability

Please help.

Solve the following system by substitution.

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

Thanks
JMS

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exam Other Question

I need to solve the following system of linear inequalities by graphing.

3x + 4y < or = 12
x + 3y < or = 6
x > or = 0
y > or = 0 I cannot figure out how to rewrite this logarithm as one simplified logarithm

log(6x)+5log(3x)-3log(9x)

Please help.

xandra