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Mathematics
Preston Warren
14 May, 11:10
Y - 5 = x 4x - y = 4 elimination
+5
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2
)
Philip
14 May, 11:16
0
(3,8)
Step-by-step explanation:
y - 5 = x
4x - y = 4
Since y-5 = x, substitute y-5 in place of x in the second equation:
4x - y = 4
4 (y-5) - y = 4
4y - 4*5 - y = 4
3y - 20 = 4
3y = 24
y = 8
Solve for x:
y - 5 = x
8-5 = x
3 = x
Check:
4x - y = 4
4 (3) - 8 = 4
12 - 8 = 4
4 = 4
Check
y - 5 = x
8 - 5 = 3
3 = 3
Check!
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Kingston
14 May, 13:48
0
y - 5 = x
4x - y = 4
Arrange:
y - 5 = x
-x + y = 5
-x + y = 5
4x - y = 4
Add together:
-x + y = 5
4x - y = 4
3x = 9
3x = 9
Solve for x:
x = 9 : 3
x = 3
Substitute and solve y:
y - 5 = x
y - 5 = 3
y = 3 + 5
y = 8
x = 3
y = 8
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