Please solve this question by using the strategy Elimination Method or Solve By Substitution. This is the math equation: 1/2x+y=15 and -x-1/3y=-6 2nd Question: 5/6x+1/3y=0 and 1/2x-2/3y=3

First pair of equations :

Multiply 2 to equation (i), we get

By Elimination Method, Add (i) and (ii) (term with x eliminate), we get

put y= 14.4 in (iii), we get

hence, x=1.2 and y =14.4

Second pair of equations :

Multiply 2 to equation (i), we get

Elimination Method, Add (i) and (ii) (term with y eliminate) , we get

put   in (i), we get

hence,   and .

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

a is the right answer