exam Maths Puzzle Numerical Ability

Solve using matrices
2x-3y=4
5x+4y=33

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exam Other Question

use the given conditions to write an equation in the point-slope form and the slope-intercept form...thank you

slope=-2, passing through (0, -3)
Solve for x in terms of a????
4a^2x^2 + 8ax + 3 = 0???