exam Maths Puzzle Numerical Ability

solve using inverse matrices

2x-y=2
2x-2y=4

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exam Other Question

Mary rows down the river from point A to point B and back. If the river flows at 4 mph and it takes 12 minutes to row down and 60 minutes to row back, how fast did she row and how Solve each of the following systems by graphing.
2x - y = 4
2x -y = 6
Solve each of the following systems by graphing.
X -2y = 8
3x -2y = 12
Solve each of the following systems by graphing.
3x -6y = 9
X -2y = 3