Find the sum: (3x3 + 2x2 + x + 4) + (2x2 - y2 - 3x + 1). O A. -x3 + x2 + 3x +5
O B. 5x3 + x2 - 2x + 5
O C. 5x3 + 4x2 - x + 5
O D. x3 + x2 - 2x+3

i believe the answer is letter c) 8

step-by-step explanation:

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative