Cristian se fue de excursion y gasto 3/10 de dinero que tenia, le queda aún $490.
Gasto y quedo
Fraccion:
Pesos:

He spent

Fraction:  3/10

Weights: $ 210

He stayed

Fraction:  7/10

Weights: $ 490

Step-by-step explanation:

On the excursion Cristian spent 3/10 of what he had, therefore he still has:

1 - 3/10 = 7/10

Now, that 7/10 represents $ 490, to calculate what value 3/10 has, it would be:

(3/10) * 490 / (7/10) = $ 210

In total he had: 210 + 490 = $700

a

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