Tolong bantu aku dong kak

Tolong bantu aku dong kak

Soal pertama :

$left(begin{array}{ccc}7~+~a\b~-~3end{array}right)+left(begin{array}{ccc}-4\1end{array}right)=left(begin{array}{ccc}-5\-2end{array}right)$

$left(begin{array}{ccc}(7~+~a)~+~(-4)\(b~-~3)~+~1end{array}right)=left(begin{array}{ccc}-5\-2end{array}right)$

$left(begin{array}{ccc}a~+~3\b~-~2end{array}right)=left(begin{array}{ccc}-5\-2end{array}right)$

$to~a~+~3~=~-5to~pink{a~=~-8}$

$to~b~-~2~=~-2to~pink{b~=~0}$

$\text{[math]}$

Soal kedua :

Titik A ( 7 , –3 ) direfleksikan terhadap garis y = –x

$to~$ A' ( –7 , 3 )

Titik A' ( –7 , 3 ) direfleksikan terjadap garis x = 3

$to~$ A" ( 2.(3) – (–7) , 3 )

$to~$ A" ( 6 + 7, 3 )

$to~pink{text{A}"~(13~,~3)}$