If x = a, y = b is the solution of the equations x – y = 2 and x + y = 4, then the value of a + 2b is _________
A) 5
B) 7
C) 9
D) 11
Answers
Answered by
1
Step-by-step explanation:
A) 5
B) 7
C) 9
D) 11
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Answered by
1
Answer:
7
Step-by-step explanation:
x – y = 2 ....... (1)
x + y = 4 ....... (2)
by elimination , addition of both equations
we have,
2x = 6
x = 6/2
x = 3
substitute x = 2 in equation (2)
x + y = 4
2 + y = 4
y = 4 - 2 = -2
y = 2
now,
a + 2b = 3 + 2(2) ( x = 3 and y = 2)
= 3 + 4
= 7
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