If y=45 when x=15 find x when y=57?

x=19

Step-by-step explanation:

To find this we need to find the simplest form of y and x

Chart:

Y            | 45 |

X            | 15  |

To find the simplest form divide both sides with their gcf which is right now 15 so divide by 15: For y 15 divided by 45 is 3, for x 15 divided by 15 is one so the graph looks like this:

Y            | 45 |  3  |

X            | 15  |  1  |

So now we know this fact we can just divide 57 by 3

(We need to divide it to see how many times does it take for 3 to get to 57 and we can use that number to multiply it with 1 and only one since when y is 3 x is 1.)

57 divided by 3 is 19

So we multiply 19 with 1 which is 19

So x is 19

Graph:

Y            | 45 |  3  |  57  |

X            | 15  |  1  |  19   |

Hope this helps!