# Pls help me find X and angle

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• March 3rd 2008, 04:11 PM
acomposto
Pls help me find X and angle
Please help with this math problem:

Angle 2 equals 10x +15 and is supplementary to angle 3 which equals 7x +42. Find x and each angle.
Thanks.
• March 3rd 2008, 04:37 PM
Aryth
If angle 2 and 3 are supplementary, then they add up to 180 degrees, therefore:

$angle_2 + angle_3 = 180$

Now we plug each equation in:

$10x + 15 + 7x + 42 = 180$

$17x + 57 = 180$

All you do now is solve for x, plug x into the two original equations and find each individual angle.

And you're done.

I hope this helps.
• March 3rd 2008, 04:39 PM
acomposto
Thanks!
Thanks so much. That's perfect.