# ACT Math 2.3 Coordinate Geometry

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ACT Math: Coordinate Geometry Drill 2, Problem 3. What is the equation of the graph in the video?

ACT Math | Coordinate Geometry |

ACT Mathematics | Coordinate Geometry |

Algebra | Coordinates and Graphs |

Coordinate Geometry | Graphing equations The relations between equations and graphs |

Foreign Language | Arabic Subtitled Chinese Subtitled Korean Subtitled Spanish Subtitled |

Geometry | Coordinate Geometry |

Language | English Language |

Product Type | ACT Math |

### Transcript

Since we have 2 points on this line, we can get that sucker straight away.

So... remember that slope is rise over run, or y2 minus y1 over x2 minus x1.

That'll give us a slope of 3 over -1.5 or just ... -2.

Now that we know m is -2, we can plug it into our equation to get y equals -2x plus b.

Now to find b...

To do that, we can just plug in one of the points. So let's just use 0, 3.

0 is the x value and 3 is the y value.

Plug in the variables and we get:

3 equals -2 times 0 plus b.

Well, -2 times 0 is 0... so b equals 3.

And our answer is C.