Subtract <math><mstyle displaystyle="true"><mn>3</mn><mi>x</mi></mstyle></math> from both sides of the inequality.

Find the intersection of <math><mstyle displaystyle="true"><mi>y</mi><mo>≤</mo><mn>9</mn><mo>-</mo><mn>3</mn><mi>x</mi></mstyle></math> and <math><mstyle displaystyle="true"><mi>y</mi><mo>≥</mo><mn>4</mn></mstyle></math> .

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