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121. Give the graphical solution of the following systems of inequality.
x + y ≤ 6, x + y ≥ 4

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122. Give the graphical solution of the following systems of inequality.
5x + 4y ≤ 20, x ≥ 1, y ≥ 2

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123. Give the graphical solution of the following systems of inequality.
x - 2y ≤ 3, 3x + 4y ≥ 12, x ≥ 0, y ≥ 1

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124. Give the graphical solution of the following systems of inequality.
x + 2y ≤ 10, x + y ≥ 1, x - y ≤ 0, x ≥ 0, y ≥ 0

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125. Give the graphical solution of the following systems of inequality.
4x + 3y ≤ 60, y ≥ 2x, x ≥ 3, x, y ≥ 0

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126.

Find the linear inequalities for which the shaded area in the figure given below is a solution.

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128. Draw the graph of the following inequality:
x ≤ -2

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129. Draw the graph of the following inequality:
y ≥ 2

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130. Draw the graph of the following inequality:
y < -3

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