book Maths Puzzle Numerical Ability

y-4x=8

3y=2x-3

y=-3/4x

-x+y=7

i am supposed to graph the equationsby plotting the points

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book Other Question

two parallel chords, 16 cm and 30 cm are 23 cm apart. find the radius of the circle that contains them. (-7)x(+3)= the answers are....-4, -21, -10, or 4