For each function, y varies dirctly with x. find each constant of variation. y=4 when x=-3

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.

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