exam Maths Puzzle Numerical Ability

i need help graphing equations for example:i need help on using k=Mx+b= and the Y2-Y1
X2-X1
please help me i would like that very much

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exam Other Question
Use elimination to solve: x/2+2y=9
2x-y=18 2x^(4/3)+x^(2/3)=10