Book Maths Puzzle Algebra

Solve system of equation (for x and y coordinate): 7x-2y=12 x=.5y+3

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Book Other Question

find the answer using linear equations

A plumbing contractor decides to field-test two new pumps. One is rated at 60gal/h and the other at 150gal/h. She pumps a total of 930 Solve system of equation (for x and y coordinate): 4x-5y=3 -3x+4y=19