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7x + 3y =10 , -6y=-7
6y = 7
jadi : 7x + 3y+6y = 10+7
7x + 9y = 17
2. 3xkuadrat + x =22
3. 4xkuadrat-8x+20 +4xkuadrat +6x-14 =0
8xkuadrat - 2x + 6 =0
= 7x - 5y + 2y - 3
= 7x -3y - 3
B. xkuadrat + 4x - 18 + 2xkuadrat - 3x - 4
= xkuadrat + 2xkuadrat + 4x - 3x - 18 - 4
= 3xkuadrat + x - 22
C. 4(xkuadrat - 4x + 5) + 2(2xkuadrat + 3x - 7)
= 4xkuadrat - 16x + 20 + 4xkuadrat + 6x - 14
= 4xkuadrat + 4xkuadrat - 16x + 6x + 20 - 14
= 8xkuadrat - 10x + 6
semoga jawabannya benar