What is [x + y = -4][x - y =2] solved for elimination ?

Observe that the x coefficients are the same, whereas the y coefficients are opposite. This means that we can use elimation in two ways:

Method 1: SUM

If you sum the two equations, the opposite coefficients will cancel. The sum of the two equations is

Substitute this value for x in the first equation (for example) and you have

Method 1: SUBTRACT

If you subtract the two equations, the equal coefficients will cancel. The subtraction of the two equations is

Substitute this value for y in the first equation (for example) and you have

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.