book Maths Puzzle Numerical Ability

can you please show me how to graph by hand, for example y=0.4x+2

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book Other Question

What is the formula for the area of a trapezoid? The directions say to use the quadratic formula to find the roots of the following polynomials:
a) 6x^2-6-5x
b) 6x^2-6x-5
but no matter how i solve it all my soloutions are inc