Becky orders pens from an office supply company. The table shows how many pens have black ink based on the total number of pens
ordered.
Total Pens
Pens with
Black Ink
60
144
288
120
432
180
If 90 pens with black ink came in an order, how many total pens were ordered?
A 96
B. 174
O c. 216
D. 234
Total Pens
Pens with
Black Ink
60
144
288
120
432
180
If 90 pens with black ink came in an order, how many total pens were ordered?
A 96
B. 174
O c. 216
D. 234
1 answer:
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Answer:
y= -4x+7
Step-by-step explanation:
The equation of a line is usually written in the form of y=mx+c, where m is the gradient and c is the y-intercept.
Let's find the gradient of the line first.
Using the above formula,
Susbt. m= -4 into the equation:
y= -4x +c
Subst. a coordinate to find c.
When x=3, y= -5,
-5= -4(3) +c
-5= -12 +c
c= 12 -5
c=7
Thus the equation of the line is y= -4x +7.