Tell whether the equation −4x + 2y = 2 represents a direct variation. If so, identify the constant of variation.

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

Y=21.95x+10 y=22.45x solve by substitution