book Maths Puzzle Numerical Ability

solve the equation 7x = 42

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book Other Question

Solve the system by graphing.
2x + y = 6
2x � y = 0
This is how I am doing these, if I am wrong please show me how.
2x=6 2*0+y
x=3 y=6
(3,0) (0,6)

2x-y*0=0 Area of a parallelogram. Find a trinomial that represents the area of a parallelogram whose base is 3x + 2 meters and whose height is 2x+3.