The equation of a straight line can always be put into the form "y=mx+c".
Always. Any equation can be put into slope intercept form. Take x+5y=16, for example. This would be changed into y=16/5 + x/5.
I accidently do not finish the equation part. I will put it up
You model your equation on a number line to using a bar model.
Yes normally
It is true for all permissible values of any variables in the equation. More simply put, it is always true.
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Assume the equation is y = kx + c Put in the x and y values of your known coordinates and sove the simultaneous equations.