Find the weight of a package that can be shipped for $12.50 using the equation y = 3x + 5 where y is the total cost and x is the weight of the package.

2.5

Step-by-step explanation:

So you know that y is the total cost so you can put $12.50 in to substitute y.  You then end up with the equation $12.50 = 3x+5.  Nest you need too get x by itself so subtract 5 from the left and subtract 5 from the 12.50 which leaves you with $7.50 = 3x.  Next we have too divide both &7.50 and 3x by 3 to get x by itself.  This leaves you with 2.5 = x.  Therefor your answer is 2.5.

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

13cm

step-by-step explanation:

(apex)