If 7 pens weigh 68.4 grams, how many grams will 4 pens weigh?

Mathematics

1 answer:

inysia [295]2 years ago

7 0

Answer:

Step-by-step explanation:

Step 1- Divide the total grams of 7 pens

68.4 divided by 7= 9.77143

Step 2- Multiply by 4

9.77143 times 4= 39.08572

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To start, the equation has to be converted to slope-intercept form, or $y=mx+b$ . Start by subtracting x from both sides; $x-x+2y=4$ , $2y=4-x$ . Switch 4 and -x around to conform to the formula; $2y=-x+4$ . Then divide by 2 to isolate y; $y=-\frac{1}{2}x+2$ . This is the final equation. Because the slope of a line perpendicular is always the opposite reciprocal (i.e. The opposite reciprocal of 4 is $-\frac{1}{4}$ , the opposite reciprocal of $-\frac{1}{5}$ is 5) the opposite reciprocal of $-\frac{1}{2}$ is 2. So the equation of the line is $y=2x$ , and the answer is A.