exam Maths Puzzle Numerical Ability

Using the Gauss-Jordan elimination on the following linear system, what would the augmented matrix be?

3w-x=2y+z-4
9x-y+z=10
4w+3y-z=7
12x+17=2y-z+6

The way I have tried t

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exam Other Question

decide all values of b in the following equations that will
give one or more real number solutions.
(a) 3x^2 + bx - 3 = 0
(b) 5x^2 + bx + 1 = 0
(c) -3x^2 + bx - 3 = 0 What is the slope and graph for this problem?

y=px+d

where y is the total cost for the chairs
where p is the price per chairs
where x is the number of chairs
where d is t