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Vitek1552 [10]
2 years ago
7

Solve for x 7(x - 3) = 4(x + 5)

Mathematics
2 answers:
Advocard [28]2 years ago
7 0

Answer:

13 2/3

Step-by-step explanation:

AleksAgata [21]2 years ago
3 0
1: expand the bracket by multiplying the 7(x-3) and 4(x+5)
2:take away the smallest x, which is 4x
then you’re left with
3x-21=20
3: add the -21 to the other side of = sign
you’re left with 3x=41
4: divide by 3
5: x=13.6667
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System of equations by substitution<br> how do this?<br> y= x+2<br> y= -4x+7
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Equations are given,
y= x+2
<span>
y= -4x+7

As you can see both the expressions, x+2 and -4x+7 are equal to "y". That means they are equal to each other too.

So let's equal them and solve it.

</span>x+2=-4x+7\\ \\ x+2+4x=7\\ \\ x+4x+2=7\\ \\ 5x+2=7\\ \\ 5x=7-2\\ \\ 5x=5\\ \\ x=\frac { 5 }{ 5 } \\ \\ x=1
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8 0
3 years ago
Two brothers are saving money to buy tickets to a concert. their combined saving is $55 one brother has $15 more than the other.
Vladimir [108]

Brother one: x

Brother two: x + 15

---

Make them add up to 55 in an equation.

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Combine like terms.

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Plug 20 for x into brother two.

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3 years ago
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vfiekz [6]

Answer:

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Step-by-step explanation:

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3 0
3 years ago
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