book Maths Puzzle Numerical Ability

fraction help needed

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I have to solve each equation and check my solutions. The teacher never showed us how to do the ones where the number after the = was not zero. Here is the proble... xsquared + 24 minus 5x Which system(s)of equations has no solution?
1. y = 3x - 1 and y = 3x + 1
2.x + y = 1 and y = -x + 3
3. y = 1.5x - 2 and y = 3/2 X + 2
4. 2X + Y = 4X + 2