-7y = -91
divide both sides by -7
y = 13
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Not necessarily.
x = -1/3 and y = 7/12
One can say that X+7 equals 4Y but we can not get an answer for X or an answer for Y without knowing one of them first.
x + 5y = 75y = -x + 7y = -(1/5)x + (7/5)The y-intercept of this line is +(7/5) or 1.4There is no negative y-intercept.
x = 4 and y = 7