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lorasvet [3.4K]
2 years ago
13

Solve the system of equations by substitution X=-4y X+5y=2​

Mathematics
2 answers:
MariettaO [177]2 years ago
7 0

Answer:

X=-8, y=2

Step-by-step explanation:

maw [93]2 years ago
4 0

Answer:

use -4y for x in the second equation

-4 y + 5 y = 2

so

y = 2

then x = -4(2) = -8

(-8 , 2)

Step-by-step explanation:

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4x-3y=2<br> 3x=5y=16<br> solve using substitution method
vodomira [7]

\left\{\begin{array}{ccc}4x-3y=2&|\text{add 3y to both sides}\\3x+5y=16\end{array}\right\\\left\{\begin{array}{ccc}4x=3y+2&|\text{divide both sides by 4}\\3x+5y=16\end{array}\right\\\left\{\begin{array}{ccc}x=0.75y+0.5&(*)\\3x+5y=16\end{array}\right\\\\\text{substitute}\ (*)\ \text{to the second equation}\\\\3(0.75y+0.5)+5y=16\qquad\text{use distributive property}\\\\(3)(0.75x)+(3)(0.5)+5y=16\\\\2.25y+1.5+5y=16\qquad\text{subtract 1.5 from both sides}\\\\7.25y=14.5\qquad\text{divide both sides by 7.25}

\boxed{y=2}\\\\\text{substitute the value of y to}\ (*):\\\\x=0.75(2)+0.5\\\\x=1.5+0.5\\\\\boxed{x=2}\\\\Answer:\ x=2\ and\ y=2\to(2,\ 2)

7 0
2 years ago
..........................
liubo4ka [24]

Answer:

82.96

Step-by-step explanation:

area of box:

A = L^2 = (14 in.)^2 = 196 in.^2

area of pizza:

A = (pi)r^2 = 3.14 * (6 in.)^2 = 113.04 in.^2

Empty area:

196 in.^2 - 113.04 in.^2 = 82.96 in.^2

7 0
3 years ago
If the temperature changed at a rate of -3 per hour,then after how many hours did the temperature reach -12
Oxana [17]

Answer:

If temperature is 0 then it takes 4 hours since 3 x 4 = 12 and 0 - 12 = -12

Whatever the temperature divide by three to get to 0 then add four to the quotient

8 0
2 years ago
F(x) =X/2<br> +8, what is f(x) when x = 10?<br> 04<br> 0<br> O 13<br> O 36
Blababa [14]
The answer is thirteen
7 0
2 years ago
Read 2 more answers
Tell whether (2,0) is a solution of y=7x+ 2.
sattari [20]

Answer:

No

Step-by-step explanation:

7x2=14, 14+2=16, 16 is not 0.

5 0
2 years ago
Read 2 more answers
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