Answered

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Solve the simultaneous equations
3x−4y=18
3x−y=9

Sagot :

turky69420

Answer:

-3

Step-by-step explanation:

Difference on each side is +3y and -9

3y=-9

y=-3

Answer:

[tex]x=2, y=-3[/tex]

Step-by-step explanation:

Multiply the first equation by -1 to have your two equations now be:

[tex]-3x+4y=-18[/tex]

[tex]3x-y=9[/tex]

Then add the two equations to get:

[tex]3y=-9[/tex]

Divide both sides by 3 to reach:

[tex]y=-3[/tex]

Then substitute [tex]y[/tex] for [tex]-3[/tex] in either of the two first original equations and solve for x, getting:

[tex]x=2[/tex]

Hope this helps :)

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