Question

7y+5-9=16

6×+4-13=-21

4x-2.5+3.8=6.1

5×÷8=-10

-4x÷6=40

Ecuaciones de primer grado

Answer 1

Respuesta:

$7y + 5 - 9 = 16 \\ 7y - 4 = 16 \\ 7y = 16 + 4 \\ 7y = 20 \\ y = \frac{20}{7}$

$6x + 4 - 13 = - 21 \\ 6x - 9 = - 21 \\ 6x = - 21 + 9 \\ 6x = - 12 \\ x = - 2$

$4x - 2 \times 5 + 3 \times 8 = 6 \times 1 \\ 4x - 10 + 24 = 6 \\ 4x + 14 = 6 \\ 4x = 6 - 14 \\ 4x = - 8 \\ x = - 2$

$5x \div 8 = - 10 \\ 5x = - 10 \times 8 \\ 5x = - 80 \\ x = \frac{ -80}{5} \\ x = - 16$

$- 4x \div 6 = 40 \\ - 4x = 40 \times 6 \\ - 4x = 240 \\ x = \frac{ 240}{ - 4} \\ x = - 60$