Brainliest to best answer plz explain*

0

Step-by-step explanation:

-3x +4y = 20      Multiply this equation by 2.

6x + 3y = 15

-6x + 8y = 40    Notice that -3 becomes -6, 4 becomes 8 and 20 becomes 40

 Add

11y  = 55               The xs have disappeared. Divide by 11

y = 55/11

y = 5

6x + 3y = 15

6x + 3*5 = 15

6x + 15 = 15

6x = 15 - 15

6x = 0

6x/6 = 0/6

x =0

828. all there is to it!

here, if you ever need with rounding (or other forms of arithmetic/math) again, use this:

thats the rounding one, but if you just click the top left, it shows you all the calculators you may need!

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐