Solve this equation 90x-60y is equal to 68 and 90x-70y is equal to 91

Step-by-step explanation:

90x - 60y = 68multiply by -1

90x - 70y = 91

-90x + 60y = -68 (result of multiplying by -1)

90x - 70y = 91

add

-10y = 23

y = -23/10 <===

90x - 60y = 68

90x - 60(-23/10) = 68

90x + 138 = 68

90x = 68 - 138

90x = - 70

x = -70/90

x = -7/9 <

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

i dont know

step-by-step explanation:

umm. i dont know