Question
If 
and 
what is the value of 2x - 3 ?
A) 21
B) 15
C) 12
D) 10
Hint:
Hint:
- The linear equation is an equation whose degree is 1 .
- We can solve linear equations in two variables by the substitution method.
The correct answer is: Hence, The value of 2x 3 is 21 .
Explanation:
- We have given two equations
- We have to find the value of 2x - 3
- We will first solve the given two-equation using the substitution method and then we put the value x in 2x - 3 and then get the answer.
Step 1 of 2:
The given equations are
Now, substitute the value of y in the first equation,
We will get
Step 2 of 2:
Now we will put the value of x in 2x - 3
So,
21
Final answer:
Hence, The value of is .21
Note:
We can also solve this question graphically, The point of intersection of graphs of equationswill give us the value of x. And then by putting this value we can easily get the answer.
Related Questions to study
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Note:
Whenever we use the symbol ≤ or ≥ , we use the endpoint as well. So, we use complete line to graph the solution.
Solve each inequality and graph the solution :
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Whenever we use the symbol ≤ or ≥ , we use the endpoint as well. So, we use complete line to graph the solution.
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Note:
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Note:
When we have an inequality with the symbols< or > , we use dotted lines to graph them. This is because we do not include the end point of the inequality.
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Whenever we use the symbol , we use the endpoint as well. So, we use complete line to graph the solution.
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Which of the following is the graph of the equation 
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Note:
We can also use slope-intercept method to draw the graph if the given equation. Where we will first compare the given equation with standard equation 
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Which of the following is the graph of the equation in the x y -plane?
Note:
We can also use slope-intercept method to draw the graph if the given equation. Where we will first compare the given equation with standard equation . When we get the intercepts and slope, we can easily draw the graph.
