A student is trying to solve the system of two equations given below: Equation P: y + z = 4
Equation Q: 3y + 7z = 15

Which of the following steps can be used to eliminate the y term?

−3(y + z = 4)
3(y + z = 4)
−1(3y + 7z = 15)
−3(3y + 7z = 15)

y=mx+b

step-by-step explanation:

m slope, b y-intercept

where are the graphs?

step-by-step explanation:

system of linear equation

step-by-step explanation:

as given in the data

a= 20 , b= -12

let us suppose that it is a straight line equation

now we know the formula for the system of linear equation

b= ma + c )

here m is slope of a straight line which is equal to formula

m=   (ii)

and here c is a constant

now putting the value of a and b in equation (ii)

m=

m=

putting the value of a,b and m in equation (i) gives us

-12 = + c

-12=-12 + c

adding 12 to both sides

-12 +12 = -12 +12 +c

0 =c

or c=0

as the value of the constant is zero which gives us that it is a linear equation and this order pair satisfies the system of linear equations.