Question

will medal
Number of pages 50 100 150 200
Cost 1.55 2.25 2.95 3.65
Which equation gives the cost, y, in terms of the number of pages, x?
A.
y = 0.014x + 49.15

B.
y = 0.014x + 1.55

C.
y = 0.014x + 0.85

D.
y = 58.8x + 0.85

Answer 1

just substitute two sets of values

Answer 2

pages=x, cost=y

Answer 3

whats your answer

Answer 4

hang on

Answer 5

B?? im confused now!

Answer 6

@CrashOnce

Answer 7

try again

Answer 8

your answer was close

Answer 9

c

Answer 10

good

Answer 11

\(\large {
\begin{array}{ccllll}
pages(x)&cost(y)
\\\hline\\
50&1.55\\
{\color{red}{ 100}}&{\color{blue}{ 2.25}}\\
150&2.95\\
{\color{red}{200}}&{\color{blue}{ 3.65}}
\end{array}

\\ \quad \\ \quad \\
slope = {\color{green}{ m}}= \cfrac{rise}{run} \implies \cfrac{{\color{blue}{ y_2}}-{\color{blue}{ y_1}}}{{\color{red}{ x_2}}-{\color{red}{ x_1}}}
\\ \quad \\

y-{\color{blue}{ y_1}}={\color{green}{ m}}(x-{\color{red}{ x_1}})\qquad \textit{plug in the values and solve for "y"}\\
\qquad \uparrow\\
\textit{point-slope form}
}\)

Answer 12

thanks again @CrashOnce