Question 764802
Are you sure it's "the  second number is subtracted from five times the second number"?
If so; let's make 1st number = A and 2nd number B

Elimination

2a + 5b = 90
5b - b = 36
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2a + 5b = 90...... (1)
0a + 4b = 36...... (2)
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In this case, we want to eliminate b (find the value of a) so multiply (1) with 4 and multiply (2) with 5

8a + 20b = 360
0a + 20b = 144
------------------------- -
8a             = 216
a               = 27

Substitute a to (1)
2(27) + 5b = 90
54 + 5b = 90
b = 36/5
b = 7,2

Hope this help :-)