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4 years ago

How do I solve this problem ?4x+7y=42 when X=9

Mathematics

2 answers:

schepotkina [342]4 years ago

8 0

Y
=
6
7. I think that's the answer

Rufina [12.5K]4 years ago

5 0

First you would plug in the 9 for x, then you would try to solve for y

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Solve y=x^2+23 for x

LenKa [72]

For this case we must clear x from the given equation:

$y = x ^ 2 + 23$

We passed 23 subtracting the other side of equality:

$y-23 = x ^ 2$

By definition, $a ^ 2 = b$ is written as $a = +/-\sqrt{b}$

So, we have:

$x = + / -\sqrt{(y-23)$

So, the solution of $y = x ^ 2 + 23$ for x is:

$x = + / -\sqrt{(y-23)$

Answer:

$x = + / -\sqrt{(y-23)$

$x1=+\sqrt{(y-23)$

$x2=-\sqrt{(y-23)$

7 0

3 years ago

David sold 6 apple trees. He sold 5 of the apple trees to max. What fraction of the apple trees did david sell to max

telo118 [61]

Answer:

wouldn't it be 6/5 or 5/6 or 1.2

Step-by-step explanation:

7 0

4 years ago

Is the simplified form of 2√3 − 2√3 rational? <br><br> Yes <br> No

yanalaym [24]

Answer:

Yes

Step-by-step explanation:

2√3 − 2√3 is equal to 0. So what we are trying to find out is if 0 is a rational number. 0 IS a ratinol number as it can be expressed as a fraction of integers.

6 0

4 years ago

Help me! What is the surface area of the triangular prism shaped toy car ramp shown?

dalvyx [7]

Answer:

TRY 416in²

Step-by-step explanation:

front:

8×17=136÷2=68

same for the back

back = 68

side 1=

7×15=105

side 2=

8×7=56

bottom=

17×7=119

68+68+105+56+119=416

8 0

2 years ago

After earning interest,the balance of an account is $420. The new balance is 7/6 of the original balance. How much interest did

storchak [24]

420=7/6x

The 6, who was under / now goes across the equal sign with * value.
420*6 =7x
2520 = 7x
Now the 7, who is under * value, goes across the equal sign with / value, so
2520/7 = x
x= 360.

420-360 = 60
It earned $60 of interest.

7 0

4 years ago