Really need help! Been trying to solve for a while.1. Solve the system by using a table. 3y=4x+7 , -4x-4y=28. These are the possible solutions:(–4, –3),(–3, –4), (4, 3),(3, 4).2.Solve by graphing. -3x-y=-10, 4x-4y=8. possible solutions:(-1,3), (3-1), (1,3), (3,1)
Accepted Solution
A:
3y=4x+7 ; 4x - 3y = -7 .... equn 1 -4x - 4y = 28 ========= -7y = 21 ; y = 21/-7 = -3 Substituting value of y in equn 1 4x - 3(-3) = -7 4x +9 = -7 4x = -7 -9 4x = -16 x = -4 Solution : (-4, -3) ------------------------------------- -3x - y = -10 .... equn 1 4x - 4y = 8 .... equn 2 ========= x - 5y = -2 ; x = 5y - 2 Substituting value of x in equn 1 -3(5y - 2) -y = -10 -15y + 6 -y = -10 -16y = -10 - 6 -16y = -16 y = 1 Substituting value of y in equn 1 -3x - 1 = -10 -3x = -9 x = 3 Solution : (3,1)