exam Maths Puzzle Numerical Ability

can someone help me with this problem

x=2y-7
3x+2y=-5

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exam Other Question

I am a parallelogram with an area of 80cm2 and a height of 6. What is the length of my base? 5x+10=15
6x-12=18
2x+11=21
6x-16=20
4x+12=24