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This screen walkthrough uses actual captures from the College Board version of the Desmos testing calculator.

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Enter two x plus three y equals twelve in the first expression.

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Press Enter, then type five x minus three y equals nine in the second expression.

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You can enter standard form directly.

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The two lines cross, so look for their intersection, not an intercept on an axis.

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Tap the point where the lines cross.

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The calculator shows three comma two.

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Check both original equations: two times three plus three times two equals twelve; five times three minus three times two equals nine.

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Elimination gives seven x equals twenty one, confirming x equals three and y equals two.

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If the crossing is outside the window, change the axis limits.

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A displayed decimal may be rounded; substitution checks the exact value.