Question

Select the equation in which the graph of the line has a positive slope, and the y-intercept equals -8.

Question 1 options:

x - 2y = 10


10x - 5y = 40


5x + y = 50


5x - 10y = -12

Answer 1

The slope of a line Ax+By=C is given by -A/B.
Therefore if A & B have different signs, the slope is positive.

This will help you eliminate the third equation, since coefficients of x and y have the same sign, therefore negative slope.

Now set x=0 in each of the equations and solve for y. The result is the y-intercept. Select the equation that gives y-intercept=-8.