Solve: 2x+1-14x=-71 this is for 7th grade mathematics. !

6

Step-by-step explanation:

    Pull out like factors :

  -12x + 72  =   -12 • (x - 6)  

Step  2  :

Equations which are never true :  

Solve :    -12   =  0  

A non-zero constant never equals zero.

Solving a Single Variable Equation :  

Solve  :    x-6 = 0  

Add  6  to both sides of the equation :  

                     x = 6

step-by-step explanation:

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(0,-3) see attached graph

step-by-step explanation:

a. to solve the system, graph the two equations.

x = y+3 becomes y=x-3 has m=1/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move up 1 unit and 1 unit to the right. plot a point and connect.

y=-4x+3 has m =-4/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move down four units and to the right 1 unit. plot a point and connect.

the solution is the point (x,y) where the two lines intersect. by the graph below it is (0,-3).

b. to solve by substitution, substitute y = -4x-3 into x= y+3

x= (-4x-3) +3

x=-4x

5x=0

x=0

now substitute x = 0 back in to find y.

y= -4(0)-3

y=0-3

y=-3

solution is (0,-3)

c. use elimination by adding the equations together.

x-y=3

4x+y=-3

5x=0

x=0

then substitute into one equation to find y.

y=-4(0)-3

y=-3