exam Maths Puzzle Numerical Ability

will you help me to understand how to solve simple equations such as this one: 2x+3=9.x=

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exam Other Question

Graph the function.
16)
f(x) =
4x + 2 if x < -2
x if -2 &#8804; x &#8804; 3
3x-1 if x > 3
I am lost. If anyone can help I would appreciate it. Thanks
Solve
x^2+7x-1=0

Find the x intercepts of
f(x)=x^2+7x-1