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3 years ago

5x + 7 = 42, Is x = 7 the solution for this equation? Justify your answer for it is or it is not

Mathematics

2 answers:

Doss [256]3 years ago

7 0

Answer:

7 is a solution.

Step-by-step explanation:

Step 1: Write equation

5x + 7 = 42

Step 2: Solve for <em>x</em>

Subtract 7 on both sides: 5x = 35
Divide both sides by 5: x =7

tigry1 [53]3 years ago

7 0

Answer:

Step-by-step explanation:

5x + 7 = 42

5x = 42 - 7

x = 35 / 5

x = 7

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2 years ago

Please help asap 30 pts

IgorLugansk [536]

Answer:

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Step-by-step explanation:

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3 years ago

One of the roots of the quadratic equation 4mnx^2 – 6m^2x – 6n^2x + 9mn = 0 (m, n ≠ 0) is a)-3m/2n b)3m/2n c)2m/3n d)-2m/3n

maxonik [38]

Answer:

$B.\ \frac{3m}{2n}$

Step-by-step explanation:

Given

$4mnx^2 - 6m^2x - 6n^2x + 9mn = 0\ (m, n \neq 0)$

Required

Calculate one of the root of the equation

$4mnx^2 - 6m^2x - 6n^2x + 9mn = 0$

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$2mx(2nx - 3m) -3n(2nx - 3m) = 0$

$(2mx - 3n)(2nx - 3m) = 0$

Split equation

$2mx - 3n = 0\ or\ 2nx - 3m = 0$

Make x the subject of formula in both expressions

$2mx = 3n\ or\ 2nx = 3m$

$x = \frac{3n}{2m}\ or\ x = \frac{3m}{2n}$

<em>From the list of given options, one of the roots of the equation is</em> $\frac{3m}{2n}$

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4 years ago

What is the slope of the line given by the equation y = -7x?

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