Question

Steve plotted 3 points from the equation y = 3x on this coordinate grid. He drew a straight line through the points. Which ordered pair would also be on this line? A. (+5, +15) B. (+4, +7) C. (+5, +3) D. (+12, +4)

Answer 1

For this case we have the following linear function:
 y = 3x
 We note that the slope of the line is:
 m = 3
 Therefore, we must find which of the ordered pairs satisfies the equation:
 For (5, 15) we have:
 x = 5
 y = 15
 Substituting values:
 15 = 3 (5)
 Rewriting
 15 = 15
 The equation is satisfied.
 Answer:
 An ordered pair that would also be on this line is:
 A. (+5, +15)