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Post a LessonAnswered on 18 Apr Learn CBSE/Class 9/Mathematics/Algebra/Linear equations in 2 variables
Nazia Khanum
Introduction: In this problem, we are tasked with verifying whether the values x=2x=2 and y=1y=1 satisfy the linear equation 2x+3y=72x+3y=7.
Verification: We'll substitute the given values of xx and yy into the equation and check if it holds true.
Given Equation: 2x+3y=72x+3y=7
Substituting Given Values:
Solving the Equation: 4+3=74+3=7 7=77=7
Conclusion:
Therefore, the given values x=2x=2 and y=1y=1 indeed satisfy the linear equation 2x+3y=72x+3y=7.
Answered on 18 Apr Learn CBSE/Class 9/Mathematics/Algebra/Linear equations in 2 variables
Nazia Khanum
Let's denote:
The total fare can be calculated as the sum of the initial fare and the fare for the subsequent distance.
So, the equation can be expressed as:
y=10+6(x−1)y=10+6(x−1)
Where:
Now, let's substitute x=15x=15 into the equation to find the total fare for a 15 km journey.
y=10+6(15−1)y=10+6(15−1) y=10+6(14)y=10+6(14) y=10+84y=10+84 y=94y=94
The total fare for a 15 km journey would be Rs. 94.
Answered on 18 Apr Learn CBSE/Class 9/Mathematics/Algebra/Linear equations in 2 variables
Nazia Khanum
Problem Analysis:
Given the equation 2x−y=p2x−y=p and a solution point (1,−2)(1,−2), we need to find the value of pp.
Solution:
Step 1: Substitute the Given Solution into the Equation
Substitute the coordinates of the given solution point (1,−2)(1,−2) into the equation:
2(1)−(−2)=p2(1)−(−2)=p
Step 2: Solve for pp
2+2=p2+2=p 4=p4=p
Step 3: Final Result
p=4p=4
Conclusion:
The value of pp for the equation 2x−y=p2x−y=p when the point (1,−2)(1,−2) is a solution is 44.
Answered on 18 Apr Learn CBSE/Class 9/Mathematics/Algebra/Linear equations in 2 variables
Nazia Khanum
Graph of the Equation x - y = 4
Graphing the Equation:
To draw the graph of the equation x−y=4x−y=4, we'll first rewrite it in slope-intercept form, which is y=mx+by=mx+b, where mm is the slope and bb is the y-intercept.
Given equation: x−y=4x−y=4
Rewriting in slope-intercept form:
y=x−4y=x−4
Now, let's plot the graph using this equation.
Plotting the Graph:
Find y-intercept:
Set x=0x=0 in the equation y=x−4y=x−4
y=0−4y=0−4
y=−4y=−4
So, the y-intercept is at the point (0,−4)(0,−4).
Find x-intercept:
To find the x-intercept, set y=0y=0 in the equation y=x−4y=x−4.
0=x−40=x−4
x=4x=4
So, the x-intercept is at the point (4,0)(4,0).
Drawing the Graph:
Now, plot the points (0,−4)(0,−4) and (4,0)(4,0) on the Cartesian plane and draw a straight line passing through these points. This line represents the graph of the equation x−y=4x−y=4.
Intersecting with the x-axis:
To find where the graph line meets the x-axis, we need to find the point where y=0y=0.
Substitute y=0y=0 into the equation x−y=4x−y=4:
x−0=4x−0=4
x=4x=4
So, when the graph line meets the x-axis, the coordinates of the point are (4,0)(4,0).
Answered on 18 Apr Learn CBSE/Class 9/Mathematics/Algebra/Linear equations in 2 variables
Nazia Khanum
Graphing the Equation x + 2y = 6
To graph the equation x+2y=6x+2y=6, we'll first rewrite it in slope-intercept form (y=mx+by=mx+b):
x+2y=6x+2y=6 2y=−x+62y=−x+6 y=−12x+3y=−21x+3
Plotting the Graph
To plot the graph, we'll identify two points and draw a line through them:
Intercept Method:
Slope Method: From the slope-intercept form y=−12x+3y=−21x+3, the slope is -1/2, meaning the line decreases by 1 unit in the y-direction for every 2 units in the x-direction.
Plotting the Points and Drawing the Line
Using the intercepts and the slope, we plot the points (0, 3) and (-6, 0), then draw a line through them.
Finding the Value of x when y = -3
Given y=−3y=−3, we substitute this value into the equation y=−12x+3y=−21x+3 and solve for x:
−3=−12x+3−3=−21x+3 −12x=−3−3−21x=−3−3 −12x=−6−21x=−6 x=−6×(−2)x=−6×(−2) x=12x=12
Conclusion
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