1.y = 9+4x
2(9+4x)-3x = 13
18+8x-3x = 13
5x = -5
x = -1
y = 9-4 = 5
2.
x = 10-7y
4(10-7y)+5y = -6
40-28y+5y = -6
-23y =-46
y = 46/23 = 2
x = 10-14 = -4
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Answers & Comments
1.y = 9+4x
2(9+4x)-3x = 13
18+8x-3x = 13
5x = -5
x = -1
y = 9-4 = 5
2.
x = 10-7y
4(10-7y)+5y = -6
40-28y+5y = -6
-23y =-46
y = 46/23 = 2
x = 10-14 = -4