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Kirsten Olsen
Mathematics
11 February, 06:34
8x - 6y=-16
5x + y = 28
In using Elimination?
+3
Answers (
2
)
Pranav Cole
11 February, 06:57
0
x=4
y=8
Step-by-step explanation:
8x - 6y=-16 Equation 1
5x + y = 28 Equation 2
To solve with elimination method
Multiply equation 2 by 6, the coefficient of y in equation 1, so y can have the same coefficient.
6 (5x + y = 28)
30x+6y=168 Equation 3
8x-6y=-16 Equation 1
Add equation 1 and equation 3 to eliminate y
30x+8x=38x
6y + (-6y) = 6y-6y=0
168 + (-16) = 168-16=152
38x=152
Divide both sides by 38
38x/38=152/38
x=152/38
x=4
Substitute x for 4 in equation 2
5x + y = 28
5 (4) + y=28
20+y=28
Make y the subject
y=28-20
y=8
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Eve
11 February, 07:03
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Multiple (5x+y = 28) by 6 giving you 30x + 6y = 168 and then you would add the two equations together, giving you 38x = 152, divide both sides by 38, giving you 4. after this, you would sub x=4 into one of the equations (i'm using the 5x + y = 28) which would give me 20 + y = 28, subtract 20 by both sides, giving you y = 8. so your answer is (4,8)
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