how do i know what to multiply the equation by?

Jesse S. answered • 12/04/17

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-5x+5y=-10 _________ eq 1
3x-3y=55 _________eq 2

as we want to eliminate one of 2 variable we will multiply eq 1 with 3 and eq 2 with 5 and add them

-15x +15y=-30

15x+15y= 275

________________

0=245 which is not true

so this system of equation has no solution

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