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tankabanditka [31]
1 year ago
5

3x+4y=90 X+y=25 Substitution method

Mathematics
1 answer:
Novay_Z [31]1 year ago
3 0
Step by step explanation:
X + y=25
-y. -y
X=25-y

3x +4y= 90
3(25-y) =90
75-3y=90
-75. -75
-3y =15
/-3. /-3

Y=-5
X=25-(-5)
X= 25+5
X=30
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