Question

An unknown number y is 20 more than an unknown number x. The number y is also x less than 2. The equations to find x and y are shown below:
y = x + 20
y = −x + 2

Which is a correct step to find x and y?

a) Multiply the equations to eliminate y.
b)Add the equations to eliminate x.
c) Write the points where the graphs of the equations intersect the x-axis.
d) Write the points where the graphs of the equations intersect the y-axis.

Answer 1

Answer:

b)Add the equations to eliminate x.

Step-by-step explanation:

y= x+20

y= - x+2

Result of the addition: (-x cancels x)

2y = 22

y =11

11=x +20            -9 = x

11=9+2

11 = -9 +20