WHAT IS THE TOTAL CHANGE IN MEI'S CHECKING ACCOUNT IF SHE WRITES A $35 CHECK FOR SHOES, DEPOSITS $50, AND THEN WRITES A $55 CHEC
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Lets make the graph of our systems of equations:
The blue line correspond to the equation x-y=3 and the red one correspond to 7x-y=-3. The lines intersect at point (-1,-4), then, the solution of the system is (-1,-4).
