Solve the following simultaneous equations: x+ y = 3/2; x...
Solve the following simultaneous equations: x+ y = 3/2; x - y = 5/2 and use your result to find the value of 2y + x
-2
-1
1/2
1
31/2
Correct answer is D
x + y = 32 ... (i)
x - y = 52 ... (ii)
(i) - (ii):
2y = −22 = -1
y = −12
x + y = 32
x - 12 = 32
x = 32+12
= 42
x = 2
∴ 2y + x = 2(-\frac{1}{2}) + 2
= -1 + 2 = 1.
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