Alicia necesita resolver el siguiente sistema de ecuaciones planteado aplicando el método de igualación que aprendió recientemente: ¿Cuál de las siguientes opciones es la correcta si despeja x, las iguala y simplifica los denominadores?

Seleccione una:

a.
3 - 3y = 4 + 7y

b.
2 + 2y = 4 + 7y

c.
2 - 2y = 4 + 7y

d.
1 - y = 4 + 7y

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x

assuming this is from a math graphing problem.

7 would be on the x-axis which is the horizontal line on the graph

84 would be on the y-axis which is the vertical line on the graph