Solve : 2x+4y= -2 and 3x+7y=4 by substitution method . Share with your friends Share 0 Varun.Rawat answered this The given equations are :2x + 4y = -2or, x + 2y = -1 .....1and,3x + 7y = 4 .....2from 1, we have,x = - 1 - 2y ....3now, substituting the value of x in 2, we get3-1-2y + 7y = 4⇒-3 -6y + 7y = 4⇒y = 7from 3 , we havex = - 1 - 14 = -15so, x = -15; y = 7 is the solution. -1 View Full Answer R.m. answered this let 2x+4y=-2 be the equation number (1) and3x+7y=4 be equation (2).STEP 1 : express variable x in terms of y in equation (1) :x=(-2-4y)/2 .........(3)STEP 2: Substitute (3) in (2) : 3{(-2-4y)/2} +7y=4 : (-6-12y)/2 +7y =4 : -3-6y +7y =4 : y=7..................(4)STEP 3: Substitute (4) in (3) : x={-2-4(7)}/2 ; x= -30/2 ; x= -15 therefore the solution is (-15,7)i hope my answer helps u..... all the best....... thumps up please............. 1
