Mathematics

Question

Which graph correctly represents 3x + y > 7?

NEED HELP!!
Which graph correctly represents 3x + y > 7? NEED HELP!!
Which graph correctly represents 3x + y > 7? NEED HELP!!

1 Answer

  • First rewrite the inequality in y = form.
    3x + y > 7
    Subtract 3x from both sides.
    y > -3x + 7
    Both graphs have a -3 slope and y intersect at 7. The only difference in the shading. Choose a test point to see if it makes the inequality true. The easiest point to choose is (0,0) if our line doesn't pass through that point.

    0 > -3(0) + 7
    0 > 7 is false so we want the graph where (0,0) is NOT shaded. That is the one on the left.
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