Answer:
It has three solutions.
Step-by-step explanation:
- Elimination method
- Substitution method
- Graphical method
Here are the ones which i know.
To form an equation with the given information, we use the formula :
y = mx + b, m being the slope and b being the y-intercept.
Since it is given that the slope is -9/7, we substitute m with -9/7.
y = -9/7x + b
To find b, we will substitute the known coordinates into the equation :
At point (-7 , 4), x = -7, y = 4
4 = -9/7 (-7) + b
4 = 9 + b
b = 4 - 9
b = -5
Now we know that b = -5, we will substitute b = -5 into the equation that we found earlier, y = -9/7 x + b :
y = - 9/7x - 5
To make it more readable, we can multiply the equation by 7:
7y = -9x - 5
7y + 9x + 5 = 0
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Answer : 7y + 9x + 5 = 0
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Ok, so 3 and 10, remember that, then remember 1 and 2. Subtract them both, and that will be your average speed.
Zach can send 66 text messages.
10/0.15=66.6
66.6/0.15=9.99
Answer:
y = 75
Step-by-step explanation:
Given that:
y 
⇒ y = k
where k is the constant of proportionality.
When y = 45, x = 81, then;
45 = k
45 = 9 k
k = 
= 5
k = 5
So that,
y = 5
the value of y when x = 225 is;
y = 5
= 5 x 
= 5 x 15
y = 75
