exam Maths Puzzle Numerical Ability

absolute value of 2-4

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how do you solve :
2x-6y=-16
5x+7y=-18
Please help me solve this: How many pounds of tea worth $1.50 per pound should be mixed with tea worhth $1.70 per pound to make 40 pounds of blended teas to sell at $1.55 per pound? Thank you