madrigalv47 madrigalv47
  • 03-10-2014
  • Mathematics
contestada

how to solve 0.01x+0.07y=0.22 and 0.03x-0.05y=0.14 by substitution

Respuesta :

flavour5
flavour5 flavour5
  • 03-10-2014
0.01x + 0.07y = 0.22
0.03x -0.05y = 0.14

x + 7y = 22
3x - 5y = 14

x = 22 -7y

3*(22-7y) -5y =14
66 - 21y -5y =14
-26y = - 52
y =2

x + 14 = 22

x= 8 
Answer Link

Otras preguntas

Find z_1 x z_2 for z_1 = 9(cos225° + isin225°) and z_2 = 3(cos45° + isin45°).The 'z' is all subscript.
Which option shows a DISCRETE data set? >>> CORRECT ANSWER: The NUMBER OF CARS that I pass through an intersection EVERY HOUR. >> Why is this dis
A line passes through the point (-7,-4) and has a slope of -2.Write an equation in slope-intercept form for this line.X Х?
Evaluate log3/8 91 using the change of base formula. Round your answer to one decimal place.
Points W and X are on Wx. Y and Z are on YZ. Are WX and YZ parallel, perpendicular, Or neither?3.) W(2, 1) X(6, 2) Y(2, "-2)" Z(6, "-2)"
what is a probability of surveying a student that is in math Spanish and chemistry round to the three decimal places
Question: Ramona wrote down an expression that was equivalent to... 3 . 15 + 10 (8 - 1) -82.(please look at the photo the numbers are different.)
What volume of water should be used to make a saturated solution with 150 grams of solute at 30 degrees?
Find the number of permutations of the letters in the word. APPLICATION
Solve each quadratic equation.f(x) = (x + 7)2 – 2