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sweetyus06
31.01.2020 •
Mathematics
Substitution this
-5x-6y=-15
y=3x-9
Solved
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Ответ:
So, -5x-6(3x-9)=-15
-5x-18x+54=-15
-23x=-69
x=3
Now plug in to second equation to get y.
y=3(3)-9=9-9=0
So x=3, y=0
Check with first equation:
-5(3)-6(0)=-15
-15=-15. It works.
Ответ:
-5x-6y= -15
y=3x-9
find y first. to do that, SUBSTITUTE the y equation into the larger.
-5x-6(3x-9)= -15
now use the distributive property.
-5x-18x+54= -15
the first two numbers are like terms.
-5x-18x= -23x
your equation is -23x+54= -15
since -15 is already in the other side of the equal sign, subtract 54.
-15-54= -69
-23x= -69
69÷23=3
x=3
now find y using the x value in the other equation.
y=3(3)-9
y=9-9
y=0
Your point is (3,0)
Ответ:
2√14
Step-by-step explanation:
√56
√2^2 x 14
√2^2 √14
2√14