Question

Va rog dau coroana Rapiddd

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Answer 1

Răspuns:

x + 3y = 14

2y + z = 14

a) x + 5y + z = ??

$\bf x + 3y = 14$

$\underline{ \bf 2y + z = 14 \: \: \: \: \: \: \:\:}( + )$

$\bf x + 3y + 2y + z = 14 + 14$

$\pink{ \boxed{\bf x + 5y + z = 28}}$

_________________

b) 3x + 15y + 3z = ??

$\bf x + 3y = 14 \: \: \: \bigg| \cdot3 \implies3x + 9y = 42$

$\bf 2y + z = 14 \:\:\bigg| \cdot3 \implies \underline{ 6y + 5z = 42 \: \: \: \: \:\:\:}( + )$

$\purple{ \boxed{ \bf 3x + 15y + 3z =84}}$

_________________

c) 5x + 11y - 2z = ??

$\bf x + 3y = 14 \: \: \: \bigg| \cdot5 \implies5x + 15y = 70$

$\bf 2y + z = 14 \:\:\bigg| \cdot2 \implies \underline{ 4y + 2z = 28 \:\:\:\:\:\:\:}(-)$

$\bf 5x + 15y - 4y - 2z= 70 - 28$

$\blue{ \boxed{\bf 5x + 11y - 2z= 42}}$

_________________

d) 5x + 19y + 2z = ??

$\bf x + 3y = 14 \:\:\: \bigg|\cdot5 \implies5x + 15y = 70$

$\bf 2y + z = 14 \:\:\bigg| \cdot2 \implies \underline{ 4y + 2z = 28 \:\:\:\:\:\:\:}( + )$

$\bf 5x + 15y + 4y + 2z= 70 + 28$

$\red{ \boxed{\bf 5x + 19y+ 2z= 98}}$

$= = pav38 = =$