Question

if 2x + 5 = 11 and y = -5, find the value of 4y + 5x - 8

Answer 1

Step-by-step explanation:

${ \red{ \mathfrak{given}}}$

${ \green{ \tt{y \: = \: - 5}}}$

${ \blue{ \mathfrak{2x + 5 = 11}}} \: →{ \red{ \mathfrak{ {eq}^{n} (1)}}}$

${ \blue{ \mathfrak{4y + 5x - 8}}} \: →{ \red{ \mathfrak{ {eq}^{n} (2)}}}$

Substitute equation no. (1) we get,

${ \blue{ \mathfrak{2x + 5 = 11}}}$

${ \blue{ \mathfrak{2x = 11 - 5}}}$

${ \blue{ \mathfrak{2x = 6}}}$

${ \blue{ \mathfrak{x = \frac{6}{2}}}}$

${ \blue{ \mathfrak{x = 3}}}$

Substitute the value of x and y in Equation no. (2)

then,

4y + 5x - 8

4(-5) + 5(3) - 8

-20 + 15 - 8

-20 + 7

= -13