<img src="https://tex.z-dn.net/?f=%5Csf%20Solve%5C%3A%20for%5C%3A%20x%3A-" id="TexFormula1" title="\sf Solve\: for\: x:-" alt="\

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Leno4ka [110]

2 years ago

sf Solve\: for\: x:-" align="absmiddle" class="latex-formula">
$\sf 4x-5x+9=5x-9$

Mathematics

2 answers:

Mandarinka [93]2 years ago

6 0

Answer:

x = 3

Step-by-step explanation:

=> 4x-5x+9=5x-9

=> -x-5x = -9-9

=> -6x = -18

=> x = 18/6

=> x = 3

kirill [66]2 years ago

6 0

Answer:

$\sf 4x-5x+9=5x-9 \\ \sf -x - 5x = - 9 - 9 \\ \sf \: - 6x = - 18 \\ \sf \: x = \frac{ - 6}{ - 18} = 3$

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bixtya [17]

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8 0

2 years ago

Solve. y=x - 7 5+2y=7

lesantik [10]

Answer:

$\huge\boxed{x=8;\ y=1\to(8;\ 1)}$

Step-by-step explanation:

$\left\{\begin{array}{ccc}y=x-7&(1)\\5+2y=7&(2)\end{array}\right\\\\\text{Substitute (1) to (2) and solve for x:}\\\\5+2(x-7)=7\qquad\text{use the distributive property}\\\\5+(2)(x)+(2)(-7)=7\\\\5+2x-14=7\\\\2x+(5-14)=7\\\\2x-9=7\qquad\text{add 9 to both sides}\\\\2x-9+9=7+9\\\\2x=16\qquad\text{divide both sides by 2}\\\\\dfrac{2x}{2}=\dfrac{16}{2}\\\\\boxed{x=8}$