book Maths Puzzle Numerical Ability

Graph a piecewise function in the form of y=mx+b rise/run
f(x)= 4-x if x<2
1+2x if x> or = 2

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book Other Question

I DONT GET THE INVERSE WITH EXPONENTS WITH THEM LIKE FOR EXAMPLE:
f(x)=2x^3 or f(x)=x^2-2x This is called Literal Equations.

Solve the equation 7w-10z+6=6w+12z-14 for w and express in the form w=az+b.