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MishenkaRRR
@MishenkaRRR
September 2021
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Алгебра 7 класс. Помогите, срочно, ибо хана.
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yaVolodenka
а)7x + 8y = -23;
5x + 4y = -13;
x = (-23 - 8y) / 7;
5((-23 - 8y) / 7) + 4y = -13;
(-115 - 40y) / 7 + 28y/7 = -13;
-115 - 12y = -13 * 7;
-12y = -91 + 115;
y = -(24 / 12) = -2;
x= (-23 - 8 * (-2))/ 7 = (-23 + 16) / 7 = -7/7 = -1;
x = -1; y = -2;
б)x/3 - y/5 = -3;
x/5 + y/2 = 22/5;
x = 3(y/5 - 3) = 3y/5 - 9;
(3y/5-9)/5 + y/2 = 22/5;
6y/5-18+5y = 44;
31y = (44 + 18) * 5;
y = 310 / 31 = 10;
x = 3 * 10 / 5 - 9 = 6 - 9 = -3;
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Answers & Comments
5x + 4y = -13;
x = (-23 - 8y) / 7;
5((-23 - 8y) / 7) + 4y = -13;
(-115 - 40y) / 7 + 28y/7 = -13;
-115 - 12y = -13 * 7;
-12y = -91 + 115;
y = -(24 / 12) = -2;
x= (-23 - 8 * (-2))/ 7 = (-23 + 16) / 7 = -7/7 = -1;
x = -1; y = -2;
б)x/3 - y/5 = -3;
x/5 + y/2 = 22/5;
x = 3(y/5 - 3) = 3y/5 - 9;
(3y/5-9)/5 + y/2 = 22/5;
6y/5-18+5y = 44;
31y = (44 + 18) * 5;
y = 310 / 31 = 10;
x = 3 * 10 / 5 - 9 = 6 - 9 = -3;