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y = 2x - 8

Step-by-step explanation:

To solve for slope, you need to use the formula:

m =

Then, plug in the numbers accordingly:

m =

m =

Simplify:

m = 2

Then to find the y-intercept, you take one of the coordinates (doesn't matter which one) and plug it into the equation:

Coordinate : (3, -2)

-2 = 2(3) + b

-2 = 6 + b

Subtract 6 from both sides:

-2 = 6 + b

-6   -6

_________

-8 = b

Put it all together:

y = 2x - 8

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

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