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Mathematics
Cherokee
9 April, 10:13
X-y=3
7x-y=-3
What is the answer?
+5
Answers (
2
)
Lawson Gallagher
9 April, 10:35
0
x is-1 and y is - 4
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Gonzales
9 April, 10:56
0
x=-1, y=-4
Step-by-step explanation:
x-y=3 ... (1)
7x-y=-3 ... (2)
From (1) make x the subject of formula by adding y to both sides
x=3+y ... (3)
Substitute (3) into (2)
7 (3+y) - y=-3
Open the bracket
21+7y-y=-3
21+6y=-3
Substrate 21 from both sides
6y=-24
Divide both sides by 6
y=-4
Substitute the value of y into (3)
x=3-4
x=-1
Therefore x is-1 and y is - 4
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