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Butoxors [25]
3 years ago
11

A line with a slope of -10 passes through the points of (10, -7) and (9,j) what is the value of j?

Mathematics
1 answer:
CaHeK987 [17]3 years ago
7 0
So, using our given information, we have a line of the equation y+7=-10(x-10), or y=-10x+93. Plugging in our value 9 for x, we get j = -10(9)+93 = 3.

j=3
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Alexxandr [17]

Answer:

The speed of the first car is 60 mph

Step-by-step explanation:

speed = distance/time

Solve the above equation for distance to get

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or simply

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Now we use this formula for distance to write an equation for each car.

Let s = speed of second car

Then since the speed of the first car is 10 mph faster, the first car's speed is s + 10.

The time the two cars traveled is equal but unknown, so let the time = t.

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100 = st

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Equations 1 and 2 form a system of 2 equations in 2 unknowns.

(s + 10)t = 120

st = 100

Distribute t in the first equation.

st + 10t = 120

From the second equation we know st = 100, so substitute 100 for st.

100 + 10t = 120

10t = 120

t = 2

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Equation 2:

st = 100

Substitute t with 2.

s * 2 = 100

s = 50

The speed of the second car was 50 mph.

The speed of the first car is s + 10.

s + 10 = 50 + 10 = 60

Answer: The speed of the first car is 60 mph

8 0
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Answer:

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Step-by-step explanation:

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They are variables. They stand in for different numbers in a problem. for example) a=12


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