Solve the following system of equations by linear combination: 2d + e = 8 d – e = 4

1 answer:

3 0

Because there is a +e and a -e in the two equations we can simply add them together to solve for d...

2d+e+d-e=8+4 combine like terms

3d=12 divide by 3

d=4, now use this d in either original equation to solve for e...<span>d–e=4 so

4-e=4 subtract 4

-e=0

e=0

So the solution, where the lines intersect graphically, is the point (4, 0)</span>

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Solve for x enter the solutions from the least to greatest x2+7=43 lesser x= Greater x=

Snowcat [4.5K]

Answer:

x = ±6

Step-by-step explanation:

Step 1: Write out equation

x² + 7 = 43

Step 2: Subtract 7 on both sides

x² = 36

Step 3: Square root both sides

√x² = √36

x = ±6

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3 years ago

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Alex73 [517]

Answer:

2×5×7+2×5×2+2×7×2

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Read 2 more answers

-3(5)^2-(-2)(-8) simplify

avanturin [10]

To do this, we're going to use the order of operations (PEMDAS):

P - Parentheses

E - Exponents

M - Multiplication

D - Division

A - Addition

S - Subtraction

First let's do parentheses, there isn't anythig in parentheses we need to simplify, so we can skip this step.

Next let's look for exponents. I see we have a $5^2$ so let's replace that with $5^2=25$ :

$-3(25)-(-2)(-8)$

Now let's look for multiplcation. We know that things that are right next to eachother in parentheses represent multiplcation, so let's simply this more:

$-3(25)=-75$