<img src="https://tex.z-dn.net/?f=2x-7y%3D9%5C%5Cx%2B2y%3D10" id="TexFormula1" title="2x-7y=9\\x+2y=10" alt="2x-7y=9\\x+2y=10" a

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Ksivusya [100]

3 years ago

lign="absmiddle" class="latex-formula">

Mathematics

1 answer:

coldgirl [10]3 years ago

6 0

Answer:

x=8 y=1

Step-by-step explanation:

you have first and second equation, YOU MUST FIND THE THIRD EQUATION

SOLUTION

FIND equation 3 from 2

x+2y=10

x=10-2y...........3

Substitute equation 3 from first (not from the equation where you got equation 3)

2 (10-2y)-7y=9

20-4y-7y=9

-11y=9-20

-11y= -11

-11y/-11= -11/-11

y=1

Find the value of x from the third equation

x=10-2 (1)

x=8

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