Find the best solutions to your problems with the help of IDNLearn.com's experts. Get prompt and accurate answers to your questions from our community of experts who are always ready to help.
Sagot :
3y=-6
y=-2
4x+2(-2)=6
4x-4=6
4x=10
x=5/2
(5/2,-2)
-x=-2
x=2
5(2)+2y=12
10+2y=12
2y=2
y=1
(2,1)
35x+28y=84
-35x+30y=-200
58y=-116
y=-2
5x+4(-2)=12
5x-8=12
5x=20
x=4
(4,-2)
20m+8n=-32
-20m-15n=-10
-7n=-42
n=6
5m+2(6)=-8
5m+12=-8
5m=-20
m=-4
(-4,6)
y=-2
4x+2(-2)=6
4x-4=6
4x=10
x=5/2
(5/2,-2)
-x=-2
x=2
5(2)+2y=12
10+2y=12
2y=2
y=1
(2,1)
35x+28y=84
-35x+30y=-200
58y=-116
y=-2
5x+4(-2)=12
5x-8=12
5x=20
x=4
(4,-2)
20m+8n=-32
-20m-15n=-10
-7n=-42
n=6
5m+2(6)=-8
5m+12=-8
5m=-20
m=-4
(-4,6)
[tex]1.)\\ \\\begin{cases}-4x + y = -12\\ 4x + 2y = 6 \end{cases}\\ -------- \\ 3y=-6/:3\\ \\y=-2\\ \\-4x+2=-12\\ \\-4x=-12+2[/tex]
[tex]-4x=-10/:(-4)\\ \\x=\frac{10}{4}\\ \\x=\frac{5}{2}\\ \\\begin{cases}x=\frac{5}{2} \\y=-2\end{cases}[/tex]
[tex]2.)\\ \\\begin{cases}5x + 2y = 12\\ -6x - 2y = -14 \end{cases}\\ -------- \\ -x=-2/*(-1)\\ \\x=2\\ \\5*2+2y=12[/tex]
[tex]10+2y=12 \\2y=12-10\\ \\2y=2/:2\\ \\y=1\\ \\\begin{cases}x=2 \\y=1\end{cases}[/tex]
[tex]3.)\\ \\\begin{cases} 5x + 4y = 12/*7\\ 7x - 6y = 40/*(-5) \end{cases}\\ \\\begin{cases} 35x + 28y = 84\\ -35x +30y = -200 \end{cases}\\---------- \\58y=-116/:58\\ \\y=-2[/tex]
[tex]5x+4*(-2)=12\\ \\5x-8=12\\ \\5x=12+8\\ \\5x=20/:5\\ \\x=4\\ \\\begin{cases}x=4\\y=-2\end{cases}[/tex]
[tex]4)\\ \\\begin{cases}5m + 2n = -8 /*4\\ 4m + 3n = 2/(-5) \end{cases}\\ \\ \begin{cases}20m + 8n = -32\\ -20m -15n = -10 \end{cases}\\------------ \\ -7n=-42/:(-7)\\ \\n=6[/tex]
[tex]5m+2*6=-8\\5m+12=-8\\5m=-8-12\\5m=-20/:5\\ \\m=-4\\ \\\begin{cases}n=6\\m=-4\end{cases}[/tex]
[tex]-4x=-10/:(-4)\\ \\x=\frac{10}{4}\\ \\x=\frac{5}{2}\\ \\\begin{cases}x=\frac{5}{2} \\y=-2\end{cases}[/tex]
[tex]2.)\\ \\\begin{cases}5x + 2y = 12\\ -6x - 2y = -14 \end{cases}\\ -------- \\ -x=-2/*(-1)\\ \\x=2\\ \\5*2+2y=12[/tex]
[tex]10+2y=12 \\2y=12-10\\ \\2y=2/:2\\ \\y=1\\ \\\begin{cases}x=2 \\y=1\end{cases}[/tex]
[tex]3.)\\ \\\begin{cases} 5x + 4y = 12/*7\\ 7x - 6y = 40/*(-5) \end{cases}\\ \\\begin{cases} 35x + 28y = 84\\ -35x +30y = -200 \end{cases}\\---------- \\58y=-116/:58\\ \\y=-2[/tex]
[tex]5x+4*(-2)=12\\ \\5x-8=12\\ \\5x=12+8\\ \\5x=20/:5\\ \\x=4\\ \\\begin{cases}x=4\\y=-2\end{cases}[/tex]
[tex]4)\\ \\\begin{cases}5m + 2n = -8 /*4\\ 4m + 3n = 2/(-5) \end{cases}\\ \\ \begin{cases}20m + 8n = -32\\ -20m -15n = -10 \end{cases}\\------------ \\ -7n=-42/:(-7)\\ \\n=6[/tex]
[tex]5m+2*6=-8\\5m+12=-8\\5m=-8-12\\5m=-20/:5\\ \\m=-4\\ \\\begin{cases}n=6\\m=-4\end{cases}[/tex]
Thank you for using this platform to share and learn. Keep asking and answering. We appreciate every contribution you make. Thanks for visiting IDNLearn.com. We’re dedicated to providing clear answers, so visit us again for more helpful information.