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professor190 [17]
2 years ago
10

Use the substitution method to solve the system of equations

Mathematics
1 answer:
PilotLPTM [1.2K]2 years ago
3 0

You solve the substitution method to solve a system of equality by expressing one variable in terms of the other using one equation, and then plugging this expression in the other(s).

In this case, the first equation gives us a way to express n in terms of m. So, we can replace every occurrence of n in the second equation with the given formula.

The result is

14m+2n=-8 \iff 14m+2(-7m-4)=-8 \iff 14m-14m-8=-8 \iff -8=-8

So, the second equation turned to be an equality, i.e. an equation where both sides are the same.

This implies that the system has infinitely many solutions, because every couple (n,m) such that n=-7m-4 is a solution to the system, because it satisfies both equations: the first is trivially satisfied, whereas the second is an identity, and as such is satisfied by any value of the variable.

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kkurt [141]

Answer:

y = -3, -4

Step-by-step explanation:

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3 years ago
If EF - 3x - 11, FG = 4x-10, and EG - 28, find the values of x, EF, and FG. The drawing is not to scale.
Gnom [1K]

Answer:

Part 1) x=7

Part 2) EF=10\ units

Part 3) FG=18\ units

Step-by-step explanation:

see the attached figure to better understand the problem

step 1

Find the value of x

we know that

EG=EF+FG ---> by addition segment postulate

we have

EG=28\ units\\EF=3x-11\\FG=4x-10

substitute

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solve for x

28=7x-21

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step 2

Find the value of EF

EF=(3x-11)

substitute the value of x

EF=3(7)-11=10\ units

step 3

Find the value of FG

FG=(4x-10)

substitute the value of x

FG=4(7)-10=18\ units

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Mice21 [21]

Answer:

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