Question

if x =1 ;y=2 find the values of the following expressions

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Answer 1

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Answer 2

Answer:

$4x - 3y + 5 \\ x = 1 \\ y = 2 \\ 4 \times 1 - 3 \times 2 + 5 \\ 4 - 6 + 5 \\ - 2 + 5 \\ 3$

$x ^{2} + {y }^{2} \\ {1}^{2} + 2 ^{2} \\ 1 + 4 \\ 5$

$xy + 3y - 9 \\ 1 \times 2 + 3 \times 2 - 9 \\ 2 + 6 - 9 \\ 8 - 9 \\ - 1$

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