The value of expression of x+y is 14 when x = 15 and y = -1.
What is the equation?
The equation is defined as mathematical statements that have a minimum of two terms containing variables or numbers that are equal.
To determine the value of expression of x+y,
Given that system of the equations as :
5x + 8y = 67 and
2x - y = 31
Rearranging the terms in the above equation,
y = 2x - 31
Substitute the value of y in the equation 5x + 8y = 67,
5x + 8(2x - 31) = 67
5x + 16x - 31 = 67
21x = 67 + 248
21x = 315
x = 315/21
x = 15
Substitute the value of x in the equation 2x - y = 31,
2(15) - y = 31
30 - y = 31
y = -1
Substitute the values of x = 15 and y = -1 in the expression of x+y
⇒ x+y
⇒ 15+(-1)
⇒ 14
Hence, the value of expression of x+y is 14 when x = 15 and y = -1.
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