The expression ax + by has value 7 when x = 2, y = 1. When x = -1, y = 1, it has value
1, find a and b.
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Answer:
(a,b) = (6,7)
Step-by-step explanation:
When ax + by = 7,
x = 2, y = 1
∴2a + b = 7 →Eq 1
When ax + by = 1,
x = -1, y = 1
∴- a + b = 1 →Eq 2
On adding the 2 equations, we get
a = 6
Put value of a in Eq 2
∴ -6 + b= 1
b = 6 + 1
b = 7
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