3 years ago

4(2-6x) = -80 pls help me

Mathematics

2 answers:

Angelina_Jolie [31]3 years ago

7 0

Answer:

-3

Step-by-step explanation:

Goryan [66]3 years ago

4 0

Answer:

x = $\frac{11}{3}$

Step-by-step explanation:

Given

4(2 - 6x) = - 80 ( divide both sides by 4 )

2 - 6x = - 20 ( subtract 2 from both sides )

- 6x = - 22 ( divide both sides by - 6 )

x = $\frac{-22}{-6}$ = $\frac{11}{3}$

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anyanavicka [17]

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7 0

3 years ago

Solve for x and y in the system of equation<br>3x²+4y=17 <br>2x²+5y=2<br>I'll mark brainliest

Novay_Z [31]

Answer:

$x=\pm \sqrt{11} \\y=-4.$

Step-by-step explanation:

$\left \{ {{3x^2+4y=17} \atop {2x^2+5y=2}} \right. \\\\Then\\\\\left \{ {{2 \times (3x^2+4y)=2 \times 17} \atop {3\times(2x^2+5y)=3\times2}} \right. \\\\\left \{ {{6x^2+8y=34 \quad (1)} \atop {6x^2+15y=6\quad (2)}} \right.\\\\(1)-(2) \Rightarrow -7y=28 \Rightarrow y =-4.\\Since \: \: 2x^2+5y=2 \Rightarrow 2x^2=2-5y\\\Rightarrow 2x^2=2+20=22\\\Rightarrow x^2=22:2=11\\\Rightarrow x=\pm \sqrt{11}.$