In the system of equations above, a and b are constants. If the system has an infinite number of solutions, what is the value of b ?




Comments (2)

Maybe faster? Since “infinite solutions” means they are the same line, we can just set the 2 equations equal to each other, no? For my solution, I multiplied each term in first equation by 15 to get rid of fractions, multiplied each term in second equation by 7 to rid fractions, then set equations equal. You could then see that -7b must = -60, so set 7b = 60 and solve for b.

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