exam Maths Puzzle Numerical Ability

Change the equation -2x + 8y =4 to slope intercept form.
Here are the steps I have preformed....
8y = 4 + 2y
y = 1/2 + 1/4
Is this right?

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exam Other Question

can you show me how to solve f(x)= x^2 +4
If I can see the example to find domain...I think I can explain to my son. I understand what domain is just not how to set up the problem and work it.
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