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Mathematics
Glass
19 June, 06:26
What is ...
x+8y=-15
7x+8y=-9
+1
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2
)
Brendon Payne
19 June, 07:27
0
Y = -15/8 - x
y=-9/8 - 7x
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Darwin Conley
19 June, 08:12
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The correct answer is x=1 and y=-2
to solve for x and y, you can either substitute equations or add or subtract the equation.
for my explanation, I will subtract equations.
to start, you must look at the xs and ys to find similarities. since they both have 8y, we can easily subtract the equations to cancel the y for now and find x
x+8y=-15. x+8y=-15
- (7x+8y=-9. = - 7x-8y=9
when you subtract the equations you get
-6x=-6
dividing each side by - 6 to get the x by itself will give you
x=1
then, solve for y by substituting the 1 in the x stop of either equation
I will be substituting the x in the first equation
1+8y=-15
8y=-16
y=8
both equations should give you the same answer
to check, substitute the x and y in the other equation
7 (1) + 8 (-2) = -9
7-16=-9
-9=-9
so x=1 and y=-2
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