exam Maths Puzzle Numerical Ability

Consider the line y= -7x+8.


Find the equation of the line that is parallel to this line and passes through the point(5,9).
Find the equation of the line that is perpendicular to this line and passes through the point(5.9) .

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exam Other Question
Q. Without expanding the determinant prove that:

| x+y x x |
| 5x+4y 4x 2x | = x^3
| 10x+8y 8x 3x | Can you please help with this equation.

A number is 7 less than 3 times a smaller number the difference between the number is 23.