Answer:
the 3rd 4th and 5th answers are true
Explanation:
just substitute the points into the equations.
first equation, substitute the points 2,8 into the equation. 2 + 2(8) = 20.
2 + 16 = 20
18 = 20 is not a true statement.
second equation, substitute the points -1,5 into the equation. -1 + 2(5) = 10.
-1 + 10 = 10
9 = 10 is not a true statement.
third equation, substitute the points 7,7 into the equation. 2(7) - 7 = 7.
14 - 7 = 7
7 = 7 is a true statement.
fourth equation, substitute the points 7,-7 into the equation. 3(7) + -7 = 14.
21 + -7 = 14
14 = 14 is a true statement.
fifth equation, substitute the points 1, 1 into the equation. 2(1) + 6(1) = 8.
2 + 6 = 8
8 = 8 is a true statement.