Solve the system of linear equations by substitution check your solution show work y-x=23 y=3x+11 a) 3 ,20 b)6,29 c)24,47 d)4,27 2 x-y=30 2.5 +y=5 a)8,-22 b) 122.5, 92.5 c) 10 , -20 d)11, -22.5

1. Plug in 3x + 11 where the Y is and solve for X.

3x + 11 - x = 23
2x = 12 
x = 6

Now plug back in.

y - 6 = 23
y = 23 + 6
y = 29. 

Your answer is (6, 29), option B

I can't tell what the second system of equations even is. 2x - y = 30? x - y = 30? The second equation doesn't look like it has a x-variable. It's spaced out weird. Can you just ask that in a separate question or type it in the replies? 

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )