3 years ago

Please help me !

Mathematics

2 answers:

Alik [6]3 years ago

8 0

Solve for x in the second equation first

kumpel [21]3 years ago

8 0

Answer:

Solve for x in the second equation.

Step-by-step explanation:

To solve a system of equations by substition you have to solve one of the equations for X or Y and then substitute that value on the X of the other equation, if you want to avoid fractions, you can use the x of the secon equation, like this:

$6x+18y=24\\6x=24-18y\\x=\frac{24-18y}{6} \\x=4-3y$

So by solving X for the second equation you avoided fractions when substituting the value for X on the first equation.

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A Ladder that is 32 ft long leans against a building. The angle of elevation of the ladder is 70 degrees. To the nearest tenth o

kolezko [41]

See the picture attached to better understand the problem

we know that
in the right triangle ABC
sin 70°=opposite side angle 70°/hypotenuse

in this problem
opposite side angle 70°=AB
hypotenuse=AC----> 32 ft
sin 70°=AB/32------> AB=32*sin 70°-----> AB=30.07 ----> AB=30.1 ft