Plz me, 20 points!

what is the area of trapezoid abcd?
enter your answer as a decimal or whole number in the box. do not round at any steps.

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a (-1,5) b (3,2) c (0,-2) d (-13,-11)

Alarger number is double the sum of a smaller number. the larger number is 2 less than 3 times the smaller number. if y represents the larger number and x represents the smaller number, which equations model the situation