Error Analysis Jamal's notes say to let x = 0 and solve for y to find the
y-intercept of an equation. He incorrectly
says the y-intercept of this equation is 5.

i need more details

step-by-step explanation:

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