Which statement is correct? 1. a horizontal line has no slope. 2. a vertical line has a slope of zero. 3. a line that rises from left to right has a positive slope. 4. a line that falls from right to left has a negative slope.

A line that rises from left to right has a positive slope

Step-by-step explanation:

It's 3.

Step-by-step explanation:

A line that rises from left to right has a positive slope.

1. confuses me a little because we would say a horizontal line has zero slope - but I guess that's not the same as 'no slope'.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: