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3 years ago

One number is -3 times the first number. The sum of the numbers is -4. What is the second number?

1 answer:

6 0

Lets say that the first number is x and the second number is y.
from the question we know that:
y=-3x and x+y=-4
from there, you need to replace the y in the second equation with -3x since we know that is what y equals so we can have an equation with only one variable.
x+-3x+-4
Then you solve for x.
-2x=-4
x=2
then you find y with the fact that y=-3x
y=-6

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What is an equation of the line that passing through the points (-2, -5) and (4, 7) ?

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Answer:

$y=2x-1$

Step-by-step explanation:

Use the slope-intercept formula: $y=mx+b$ where m is slope and b the y-intercept.

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Rise over run is the change in the y-axis over the change in the x-axis. Insert values:

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Now use one of the points to find the y-intercept by substituting the x and y values into the equation. Solve for b:

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The y-intercept is -1. Insert into the equation. Change the + symbol to -:

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3 years ago

In a bag of marbles, 6 are blue. The probability of picking out a blue marble from the bag is 3/5. How many marbles are in the b

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Answer: 3/5 = (6/10). There are 10 TOTAL marbles in the bag.

Step-by-step explanation:

Since it is a question of fractions, you can assume any reasonable number and work with the numbers. We know initially that there are 6 marbles and they are ALL blue and the rest are another color or colors. So BLUE = 6/10 and the other colors 4/10 for 2/5.

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