Why could 3 points on a same line not name a plan?

Express -5 2/5 as an improper fraction.

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

4. (10.03 mc) the equation of line cd is y = −2x − 2. write an equation of a line parallel to line cd in slope-intercept form that contains point (4, 5). (4 points) y = −2x + 13 y = negative 1 over 2 x + 7 y = negative 1 over 2 x + 3 − 2x − 3