exam Maths Puzzle Numerical Ability

Solve the following system by substitution
4x-12y=5
-x+3y=-1

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exam Other Question

Hi I hope I can explain the question.
The data set is known to be nonlinear. One of these quadratic regression models
X Y is for the data. Solve the following system of linear inequalities by graphing:

x-2y>=4
x<=4