exam Maths Puzzle Numerical Ability

2xy-4xt3y-6

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exam Other Question

solve the following system of equations by the substitution method:

4x=3y+30
3y-5x=-33

after substituting, find the remaining equation and the y coordinate of the solution.
I am stuck on this problem. Can someone help me solve it.
I have a lot of trouble in graphing inequalities.

Graph the iequality.
x-y>or= to 2.