Question

5. Resolver y verificar las siguientes ecuaciones.
2x +13= -15
7 X +8=64
20 = 3 X-5.(-4)
-2 x +6 x 8 = -36 + 4 + 8 X-7​

Answer 1

Respuesta:

$2x + 13 = - 15\\\\2 x = - 15 - 13\\\\2 x = -28\\\\x = \frac{-28}{2}\\\\x= -14$

Comprobación:

$2 ( - 14) + 13 = -15\\\\-28 + 13 = - 15\\\\-15=-15$

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$7x+8 = 64\\\\7 x = 64 - 8\\\\7 x = 56\\\\x=\frac{56}{7}\\\\x= 8$

Comprobación:

$7 ( 8) + 8 = 64\\\\56 + 8 = 64\\\\64 = 64$

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$20 = 3 x-5 ( - 4)\\\\20 = 3x + 20\\\\20 - 20 = 3x\\\\0 = 3x\\\\\frac{0}{3} = x\\\\0 = x$

Comprobación:

$20 = 3 ( 0 ) - 5 ( -4)\\\\20 = 0 + 20\\\\20 = 20$

Espero haberte ayudado! Saludos!