Solve this system of equations: 2x - y = 7 5x + y = 21
1 answer:
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Answer:
Part (A): The scale of y: 1 interval being equal to 500 units and from 14,000 to 18,500.
Part (B): The good interval to use for the y-axis should be 1 to 10.
Step-by-step explanation:
Consider the provided information.
As we know the X axis represents the independent variable, since years are the independent variable. So, X axis represents the years.
Y axis represents the dependent variable, since average cost is dependent variable. So, Y axis represents the average cost.
Part (A) what is a good scale to use for the y-axis?
It is given that range is from $14,000 to $18,500.
So, 1 interval being equal to 500 units, so that it will suitable for 18,500.
The scale of y should be 14,000 to 18,500 as 14,000 is the starting average cost and 18,500 is the last average cost.
Part (b) what is a good interval to use for the y-axis?
The scale for x should be 1 year. As It should start from 1 to 10.
The good interval to use for the y-axis should be 1 to 10.
The required scale is shown in figure,
Answer:
x = 13
Step-by-step explanation:
Find the diagram attached
From the diagram, the sum of angle of the straight line BCD is 180°. Hence;
<BCE+<ECF<90 = 180
<BCE+64+90=180
<BCE+154 = 180
<BCE = 180-154
<BCE = 26°
Next is to get x.
The sum of interior angles <BCE and <BEC is equal to exterior angle <ABE
<BCE + <BEC = <ABE
26+x = 3x
Collect like terms
26 =3x-x
26=2x
x = 26/2
x = 13
Hence the value of x is 13
