Given that 3x + 5y = 17 and 2x + 3y = 11, what is the value of x + y ?
Question
Given that 3x + 5y = 17 and 2x + 3y = 11, what is the value of x + y ?
Solution 1
To find the value of x + y, we can use the method of substitution or elimination. Here, I'll use the elimination method.
Step 1: Multiply the first equation by 2 and the second equation by 3 to make the coefficients of y the same in both equations. This gives us:
6x + 10y = 34 6x + 9y = 33
Step 2: Subtract the second equation from the first to eliminate y:
6x + 10y - (6x + 9y) = 34 - 33 y = 1
Step 3: Substitute y = 1 into the first equation:
3x + 5(1) = 17 3x + 5 = 17 3x = 12 x = 4
So, x = 4 and y = 1. Therefore, x + y = 4 + 1 = 5.
Solution 2
To find the value of x + y, we can use the method of substitution or elimination. Here, I'll use the elimination method.
Step 1: Multiply the first equation by 2 and the second equation by 3 to make the coefficients of y the same in both equations. This gives us:
6x + 10y = 34 6x + 9y = 33
Step 2: Subtract the second equation from the first to eliminate x:
6x + 10y - (6x + 9y) = 34 - 33 y = 1
Step 3: Substitute y = 1 into the first equation:
3x + 5(1) = 17 3x + 5 = 17 3x = 12 x = 4
So, x + y = 4 + 1 = 5.
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