Si a un número se le suma el doble de su consecutivo, se obtiene por resultado dicho número disminuido en cuatro unidades. ¿Cuál es el número?

ayuda porfa es para hoyy

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

#12 the answer is the third option