a line passes through (9, –9) and (10, –5).write an equation for the line in point-slope form.
rewrite the equation in standard form using integers.
a) y + 9 = 4(x + 9) ; -4x + y = -45
b) y - 9 = 4(x + 9) ; -4x + y = 45
c) y - 9 = 4(x + 9) ; -4x + y = -45
d) y + 9 = 4(x + 9) ; -4x + y = 45
^^ the options look pretty similar, so make sure you're answering correctly! you : )

bearing in mind that standard form for a linear equation means

• all coefficients must be integers, no fractions

• only the constant on the right-hand-side

• all variables on the left-hand-side, sorted

• "x" must not have a negative coefficient

quick note:

the "x" must not have a negative coefficient for the standard form, though in this case it shows like so in the inappropriate choices above.

where are the choices?

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.