book Maths Puzzle Numerical Ability

Use the Gauss Jordan method to solve the system of equations:
x+y+2z=7
3x-y+z=10
2x+y-3z=-6

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book Other Question

Handy andy sell one-gallon cartons of milk (4quarts) for $3.09 each half-gallon cartons for $1.65 each. Assume that the number of cents you pay for a carton of milk varies linearl {9x-y-2z=18
{5x-2y+z=10
{4x+y-3z=8 please help me with this