Bret is examinig a line with equation y =3x - 7. he says that the y- intercept is 7. is he correct? explain

No when x=0
y=0-7
so y intercept is -7

He is wrong because in the equation that you clearly stated which is y=3x-7 the y intercept is -7 as in negative 7 not positive 7 the normal equation goes like this : y=mx+b. y is the total ... Mx is the Slope And b is the y intercept ... If you want to know how to graph it it's simple.. Y=3x-7 The y intercept is -7 so you have to graph or plot it .. On the Y axis you go 7 point a down and you put a dot there. Now you are done with the first step.. You see 3x as the Slope and you obviously need a slope so your need to change the Slope into a fraction so just make 3x over 1 .. When you have a whole number like this always put this over one. Now we are going to do the rise over run method. This mean.. Rise is up and down run is right and left the numerator in the slope is 3 and it is also a positive number so you go 3 digits up from -7. Your not done yet you still have the dominator which is the 1 according to the rise over run method we passed rises now run. Number 1 is a positive donimnator so you go to the right. now you got your graphing solved. Ok y=3x-7 Locate -7 in the y intercept than 3 up and 1 to the right now your done graphing. I answered your question in the beginning of the sentence however I ADDED information that you will need to know around 7th or 8th grade or later on the unit you have now. your welcome :)