Answer:
$43
Step-by-step explanation:
<h3>The 2-point form of the equation for a line is useful for this. It tells you .</h3><h3> y = (y2 -y1)/(x2 -x1)(x -x1) +y1</h3><h3 /><h3>for a line through (x1, y1) and (x2, y2).</h3><h3 /><h3>The points we are given are (200, 23) and (500, 35). We want to find the value of y for x=700. Putting all those numbers into the above equation gives ...</h3><h3 /><h3> y = (35 -23)/(500 -200)(700 -200) + 23 . . . . . the linear equation</h3><h3 /><h3> y = 12/300·500 +23 = 43 . . . . . . the solution</h3><h3 /><h3>The cost to order 700 cards is $43.</h3><h3 /><h3 />