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Could someone help me do this using substitution I need to know how to do this for math
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1 vote
Could someone help me do this using substitution I need to know how to do this for math

Could someone help me do this using substitution I need to know how to do this for-example-1
User Vlad Rudskoy
by
8.0k points

2 Answers

4 votes
y-7=2-8y
+8y +8y
___
9y-7=2
+7 +7
____
9y=8
_______
9
y=0.88
User Jens Lundstrom
by
8.3k points
6 votes
x=y-7
x=2-8y
both equal x so
subsitute y-7 for x in other equaton
y-7=2-8y
add 8y
9y-7=2
add 7
9y=9
divide 9
y=1
sub back
x=y-7
x=1-7
x=-6

(x,y)
(-6,1)
User Halis
by
8.3k points
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