How many solutions does the following equation have ? -4.2 – 7 + 10r = -7 + 6r
A) no solutions
B) Exactly one solution
C) infinitely many solutions

B) Exactly one solution

Step-by-step explanation:

since both equations are linear, this must mean the system can only have 1 solution, where the lines can only intercept once with ech other.

the answer is d

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18