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find the value of x and y for each?
1.2y+5=x and x+y=95
2.x+2y=40 and 4x-y=70
2 Answers
- 1 decade agoFavorite Answer
1.
2y+5=x-----------(1)
x+y=95-----------(2)
substitute (1) into (2):
(2y + 5) + y = 95
3y +5 = 95
3y = 90
y= 90/3
y= 30
Substitute y=30 into equation (2):
x + 30 = 95
x = 65
therefore, for the first question, x = 65 and y = 30
2.
x+2y=40 and 4x-y=70
Similarly, let the equations to be (1) and (2) respectively
x+2y = 40------------(1)
4x-y= 70--------------(2)
From (1):
x= 40 - 2y----------------(3)
substitute (2) into (1):
4(40 - 2y) - y= 70
160 - 9y = 70
90 = 9y
y = 10
substitute y= 10 into (1):
x + 2(10) = 40
x = 20
Therefore, for the second question, x = 20 and y=10.
- ?Lv 41 decade ago
1) 2y+5+y=95, 3y=90, y=30, x+30=95, x=65. so x=65, y=30
2) x=40-2y, 4(40-2y)-y=70,160-8y-y=70, -9y=90, y=-10, 4x-(-10)=70, 4x=60, x=15. so x=15, y=-10
