18. Write the coefficient of $7xy$ in $x^2 - 7xy + 2y^2$ 19. If $a = 4x - 5y$, $b = 7x + 3y$, $c = 2y - 3x$ Find $a + b - c$

          18. Write the coefficient of $7xy$ in $x^2 - 7xy + 2y^2$
19. If $a = 4x - 5y$, $b = 7x + 3y$, $c = 2y - 3x$ Find $a + b - c$

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