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UNO [17]
3 years ago
12

Y=3x+13 2x=y-9 Solve for x and y points using addition method

Mathematics
2 answers:
GrogVix [38]3 years ago
6 0
y=3x+13 \\
2x=y-9 \ \ \ |-y-2x \\ \\
y=3x+13 \\
\underline{-y=-2x-9} \ \ \ \hbox{add the sides} \\
y-y=3x-2x+13-9 \\
0=x+4 \\
x=-4 \\ \\
y=3x+13=3 \times (-4)+13=-12+13=1 \\ \\
\boxed{(x,y)=(-4,1)}
Delvig [45]3 years ago
3 0
Y = 3x + 13
<u>y = -2x + 9</u>
2y = x + 22
<u>2y </u>=<u> x + 22</u>
 2        2
y = 1/2x + 11
1/2x + 11 = 3x + 13
<u>-1/2x       -1/2x        </u>
           11 = 2 1/2x + 13
   <u>      -13                 - 13
</u>            -2 = 2 1/2x
           <u>  -2</u> = <u>2 1/2x</u>
         2 1/2    2 1/2
          -0.8 = x
y = 3(-0.8) + 13
y = -0.24 + 13
y = 12.76
(x, y) = (-0.8, 12.76)
<u />

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