Wolfrich lived in Portugal and Brazil for a total period of 14 months in order to learn Portuguese.
He learned an average of 130 new words per month when he lived in Portugal and an average of 150 new
words per month when he lived in Brazil. In total, he learned 1920 new words.
How long did Wolfrich live in Portugal, and how long did he live in Brazil?
Wolfrich lived in Portugal for
months and lived in Brazil for
months.

21

step-by-step explanation:

125 yards

step-by-step explanation:

i take 75 plus 50.

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