Question

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Answer 1

Step-by-step explanation:

x+y=90

x=2y+15

Substitute value of x in first equation

x+y=90

2y+15+y=90

3y=90-15

3y=75

y=75/3

y=25

substitute y=25in equation 2nd

x=2y+15

x=2*25+15

x=75

Answer 2

x+y=90

x-2y=15

Now adding them both,

x+y+x-2y=90+15

2x-y=115

x+y=90

Now again adding them both,

x+y+2x-y=115+90

3x=205

x=205/3

=68.4

If x=68.4

then y=90-68.4

=21.6