SOLUTION: The sum of the measures of an acute angle and an obtuse angle is 140. The sum of twice the supplement of the obtuse angle and three times the complement of the acute angle is 340.

Algebra ->  Equations -> SOLUTION: The sum of the measures of an acute angle and an obtuse angle is 140. The sum of twice the supplement of the obtuse angle and three times the complement of the acute angle is 340.       Log On


   



Question 1194130: The sum of the measures of an acute angle and an obtuse angle is 140. The sum of twice the supplement of the obtuse angle and three times the complement of the acute angle is 340. What are the measures of the angles?
Found 2 solutions by MathLover1, josgarithmetic:
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

The sum of the measures of an acute angle and an obtuse angle is 140.
let an acute angle be x and an obtuse angle y
x+%2B+y+=+140
x+=+140-y.........eq.1
The sum of twice the supplement of the obtuse angle and three times the complement of the acute angle is 340.
if
the supplement of the obtuse angle: 180+-+x
the complement of the acute angle:90+-+x
we have:
2%28180+-+x%29+%2B+3%2890+-+y%29+=+340
since x+=+140+-+y
2%28180+-+%28140+-+y%29%29+%2B+3%2890+-+y%29+=+340
2%28180+-+140+%2B+y%29+%2B+3%2890+-+y%29+=+340
2%2840+%2B+y%29+%2B+3%2890+-+y%29+=+340
80+%2B+2y+%2B+270+-+3y=+340
350++-+y=+340
y+=+350-340
y+=+10
x+=+140-10
x+=+130
the measures of the angles are: +10 and +130


Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
If you prefer two variables:

x, the meas of the acute angle
y, the meas of the obtuse angle
x%2By=140

Supplement of y, 180-y
Complement of x, 90-x

The description second sentence
2%28180-y%29%2B3%2890-x%29=340
360-2y%2B270-3x=340
-3x-2y=340-360-270
3x%2B2y=290

system: system%28x%2By=140%2C3x%2B2y=290%29

multiply the first by 2
system%282x%2B2y=280%2C3x%2B2y=290%29


system%28highlight%28x=10%29%2Chighlight%28y=130%29%29