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Mathematics
Ian Armstrong
21 March, 19:47
What is the x and y to 3y+7x=4 - 6x+y=-7
+1
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Blair
21 March, 23:33
0
x=1 and y=-1
Step-by-step explanation:
Lets name the equations as
3y+7x=4 or 7x+3y-4=0 ... eq (1)
-6x+y=-7 or - 6x+y+7=0 ... eq (2)
multiplying eq (2) with 3 and subtracting eq (1) from eq (2)
(-6x+y+7=0) * 3
(-18x+3y+21) - (7x+3y-4) = 0
we can write it as
-18x+3y+21-7x-3y+4=0
-25x + 25=0
-25x=-25
x=1
plugging the value of x in eq (1)
7*1+3y-4=0
7+3y-4=0
3y+3=0
3y=-3
y=-1
so x=1 and y=-1
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