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Paha777 [63]
3 years ago
6

3x+2y=4 4x+5y=17 What is the value of x and y?

Mathematics
2 answers:
andrew-mc [135]3 years ago
8 0
3x+2y=4|\cdot(-4)\\
4x+5y=17|\cdot 3\\\\
-12x-8y=-16\\
\underline{12x+15y=51}\\
7y=35\\
y=5\\\\
3x+2\cdot5=4\\
3x+10=4\\
3x=-6\\
x=-2\\\\
\boxed{(x,y)=(-2,5)}
Fudgin [204]3 years ago
5 0
{3x+2y=4    /*5
{4x+5y=17    /*(-2)

{15x+10y=20
<u>{-8x-10y=-34        </u>(+)
<em>7x=-14</em><em />
<em>x=-2</em>

15x+10y=20
15*(-2)+10y=20
-30+10y=20
10y=50
<em>y=5</em>

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