Solve algebraically the simultaneous equations

x^2 + y^2 =25
y-2x = 5

Therefore the solutions are

Step-by-step explanation:

Given:

.........( 1 )

    ................( 2 )

To Find:

x = ?

y = ?

Solution:

Substituting ' y ' in Equation  1 we get

Using identity (A+B)²=A²+2AB+B² we get

Now Substitute x =0 in equation 2 we get

Or

Now Substitute x =-4 in equation 2 we get

Therefore the solutions are

i think it is c, not positive though

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have