exam Maths Puzzle Numerical Ability

Use elimination to solve: x/2+2y=9
2x-y=18

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exam Other Question

find the second coordinates of the points with first coordinates 0 and 1 of the following function f(x)=3(4) 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