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2 years ago

Which equations are true?

Mathematics

1 answer:

Vlad [161]2 years ago

7 0

Answer:

Step-by-step explanation:

1)4.5m+4.7=20m+47

4.5m-20m=47-4.7

-15.5m=42.2

m=-2.72

2)14+21w=7(2+3w)

41+21w=14+21w

21w-21w=14-41

3)49r+35=7(7r+35)

49r+35=49r+245

49r-49r=245-35

4)9(8h-3)=72h-27

72h-27=72h-27

72h-72h=-27+27

5)5.2+5.3t=10+15t

5.3t-15t=10-5.2

-9.7t=4.8

t=4.8/-9.7

t=0.49

6)6f+3.111=18f-33

6f-18f=-33-3.111

-12f=-36.111

f=-36.111/-12

f=3.01

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3 years ago

NO LINKS!! Use the method of substitution to solve the system. (If there's no solution, enter no solution). Part 11z

Roman55 [17]

Answer:

$(x,y)=\left(\; \boxed{-1,-8} \; \right)\quad \textsf{(smaller $x$-value)}$

$(x,y)=\left(\; \boxed{5,16} \; \right)\quad \textsf{(larger $x$-value)}$

Step-by-step explanation:

Given system of equations:

$\begin{cases}y=x^2-9\\y=4x-4\end{cases}$

To solve by the method of substitution, substitute the first equation into the second equation and rearrange so that the equation equals zero:

$\begin{aligned}x^2-9&=4x-4\\x^2-4x-9&=-4\\x^2-4x-5&=0\end{aligned}$