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maw [93]
3 years ago
14

in order to solve the system of equations below , harvey multiplies each equation by a constant to eliminate the x terms.

Mathematics
1 answer:
kicyunya [14]3 years ago
6 0

Answer:

14x + 6y = 10 \\  - 14x - 35y = 77

multiply all terms in the top equation by 2

multiply all terms in the second equation by -7. it would then add the two equations together to cancel out the variable x

You will then have two equations in terms of y

solve for y and either equation then substitute that value for y into the other equation then solve for x

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3 years ago
Joe is building a post for his mailbox. To find the correct dimensions, he needs to expand this expression: (x-3) (x-9) (x-4) Se
kolbaska11 [484]

Answer:

(x-3)(x-9)(x-4)=x^3-16x^2+75x-108

Step-by-step explanation:

Given:

The expression to expand is given as:

(x-3)(x-9)(x-4)

Let us expand the first two binomials of the given expression using FOIL method.

The FOIL method states that:

(a + b)(c + d) = ac + ad + bc + bd

(x-3)(x-9)=(x\times x)+(x\times -9)+(-3\times x)+(-3\times -9)\\\\(x-3)(x-9)=x^2-9x-3x+27=x^2-12x+27

Now, let us multiply the result with the remaining binomial. Multiplying each term of the trinomial with each term of the binomial, we get:

(x^2-12x+27)(x-4)\\\\= (x^2\times x)+ (x^2\times -4)+(-12x\times x)+(-12x\times -4)+(27\times x)+(27\times -4)\\\\=x^3-4x^2-12x^2+48x+27x-108\\\\=x^3-16x^2+75x-108...........(\because-12x^2-4x^2=-16x^2,48x+27x=75x)

Therefore, the equivalent expression after expanding is given as:

(x-3)(x-9)(x-4)=x^3-16x^2+75x-108

3 0
3 years ago
How to solve -8-7x+5=4
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3 years ago
Whats 2 plus 2 x 5 free 100 points
faltersainse [42]

Answer:

12

Step-by-step explanation:

2+2*5

2*5=10

10+2=12

7 0
3 years ago
Read 2 more answers
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