Pergunta

solve using elimination. -3x+y=-12 9x-9y=-18 d square D
Solução

4.6337 Voting

AlexandreMestre · Tutor por 5 anos
Responder
To solve the system of equations using elimination, we can follow these steps:
1. Multiply the first equation by 3 to make the coefficients of y in both equations equal:
-9x + 3y = -36
9x - 9y = -18
2. Add the two equations together to eliminate y:
-9x + 3y + 9x - 9y = -36 - 18
-6y = -54
3. Divide both sides of the equation by -6 to solve for y:
y = 9
4. Substitute the value of y into one of the original equations to solve for x. Let's use the first equation:
-3x + 9 = -12
-3x = -21
x = 7
Therefore, the solution to the system of equations is x = 7
1. Multiply the first equation by 3 to make the coefficients of y in both equations equal:
-9x + 3y = -36
9x - 9y = -18
2. Add the two equations together to eliminate y:
-9x + 3y + 9x - 9y = -36 - 18
-6y = -54
3. Divide both sides of the equation by -6 to solve for y:
y = 9
4. Substitute the value of y into one of the original equations to solve for x. Let's use the first equation:
-3x + 9 = -12
-3x = -21
x = 7
Therefore, the solution to the system of equations is x = 7
and y = 9
.
Clique para avaliar: