Book Maths Puzzle Algebra

Need to solve linear system equation (with fractions) by elimination or substitution. Thanks!

2/5x + 3/2y = 2
7/3x - 5/4y = -5

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Book Other Question

Wind speed of 40 mph exerts a 50# force on a 500 sqft area, what force would an 80 mph wind exert on a 2 sqft area? (This problem seems deceptively easy, if the relationships are l Using 7 four times can you get that to add up to 100 using any operation or any math symbol