The answer is a
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The value of x and y in the equation -5x + 8y = -21 and 3x - 4y = 15 are 9 and 4 respectively.
<h3>What is an equation?</h3>
An equation is the statement that illustrates that the variables given. In this case, two or more components are taken into consideration to describe the scenario. It is vital to note that an equation is a mathematical statement which is made up of two expressions that are connected by an equal sign.
The equation is given as:
-5x + 8y = -21
3x - 4y = 15
Multiply equation i by 3
Multiply equation ii by 5
-15x + 24y = -63
15x - 20y = 75
Add both equations
4y = 12
Divide
y = 12/4
y = 3
From 3x - 4y = 15
3x - 4(3) = 15
3x - 12 = 15
Collect like terms
3x = 12 + 15
3x = 27
Divide
x = 27/3
x = 9
Therefore, x = 9 and y = 4.
Learn more about equations on:
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Problem: Find the Unit rate in meters per second of the given numbers.
Given = A car travels 156 meters in 13 seconds
Solution = So the number that we have in meters is 156 and In seconds is 13.
Now, we need to find the unit rate for this. Simply divide 156 by 13 to get the value of meters per 1 second.
=> 156 / 13 = 12
Thus the unit rate is:
=> 12 meters per second
72⁰_______3π m
360⁰______15π m
C = 15π = 2π r
r = 7•5 m