+371 A linear function represents Caitlin's income. She earns $35 plus $8 for each item she sells. Determine whether each point is on the graph of her earings, y, as a function of a number of items sold, x. select each ordered pair that is on the graph.
a. (7,91)
b. (11.121)
c. (9,110)
d. (4,67)
e. (5,72)
f. (3,59)
+130514 The linear function we are dealing with is :
y = 8x + 35
So....just put the first value for each ordered pair into the equation for x and see if it produces the second value of the ordered pair....if it does, that point is on the graph...
For instance....for the point (7, 91) we have
y = 8(7) + 35 = 56 + 35 = 91.......so this point is on the graph......
+130514 The linear function we are dealing with is :
y = 8x + 35
So....just put the first value for each ordered pair into the equation for x and see if it produces the second value of the ordered pair....if it does, that point is on the graph...
For instance....for the point (7, 91) we have
y = 8(7) + 35 = 56 + 35 = 91.......so this point is on the graph......
+1491 For this kind of problem, I recomend you write the function out. I'll demonsrate for you:
Since she earns $35 that's a constant (meaning no variable goes with it) and $8 for every item that she sells (let the # items equal x since $8 is the coeffecient of the # of items she sells). y of course will be her total earnings. Using this information you should obtain the equation:
$35 + $8x = y
Now use the "coordinates" to plug in solutions for x and y.
Hope I helped you understand the concept. c:
