4. A straight line passes through points (3, 12) and (7,4). What is the equation of the line?

Mathematics

2 answers:

jeyben [28]2 years ago

6 0

Answer:

slope is -2 (-8/4)

point slope formula y=y1=m(x-x1) m slope (x1, y1) point

y-4=-2(x-7)

y=-2x+18

Arte-miy333 [17]2 years ago

4 0

Answer:

y=-2x+18

Step-by-step explanation:

Since the y-value is going down, we can assume that the line is going negative. As the midpoint is (5, 8), you should subtract 2 units from 3 and 4 units from 12 to get (1, 16) and therefore to get to (-1, 20), since the y-intercept is 18, the slope is 2, and it is going negative, your final answer is y=-2x+18.

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Write an equation to represent 'twice a number (x) is fifty"

V125BC [204]

Hi there,

Your question is "twice a number (x) is fifty"

Recall how a number is represented by x.

Twice a number would be represented as 2x.

Therefore, to represent that twice a number is equal to 50, that would result in the expression: $2x=50$

If you're looking to solve this equation, it's often best to think about the "reverse" of the current equation.

Notice how 2 is multiplying the x.

To isolate x, divide that side by 2.

However, recall that whatever is done to one side of an equation must also be done to the other side of the equation. Therefore, you will need to divide both sides by 2.

$2x=50$

$\frac{2x}{2} = \frac{50}{2}$